diff --git a/oks_cli/cluster.py b/oks_cli/cluster.py
index d1d14c7..9868f5f 100644
--- a/oks_cli/cluster.py
+++ b/oks_cli/cluster.py
@@ -23,7 +23,7 @@
                    ctx_update, set_cluster_id, get_cluster_id, get_project_id,  \
                    get_template, get_cluster_name, format_changed_row,          \
                    is_interesting_status, profile_completer, project_completer, \
-                   kubeconfig_parse_fields, print_table, format_row
+                   kubeconfig_parse_fields, print_table, format_row, apply_set_fields
 
 from .profile import add_profile
 from .project import project_create, project_login
@@ -371,8 +371,9 @@ def _create_cluster(project_name, cluster_config, output):
 @click.option('--output', '-o', type=click.Choice(["json", "yaml"]), help="Specify output format, by default is json")
 @click.option('--filename', '-f', type=click.File("r"), help="Path to file to use to create the cluster ")
 @click.option('--profile', help="Configuration profile to use", shell_complete=profile_completer)
+@click.option('--set', 'set_fields', multiple=True, help="Set arbitrary nested fields, e.g. auth.oidc.issuer-url=value")
 @click.pass_context
-def cluster_create_command(ctx, project_name, cluster_name, description, admin, version, cidr_pods, cidr_service, control_plane, zone, enable_admission_plugins, disable_admission_plugins, quirk, tags, disable_api_termination, cp_multi_az, dry_run, output, filename, profile):
+def cluster_create_command(ctx, project_name, cluster_name, description, admin, version, cidr_pods, cidr_service, control_plane, zone, enable_admission_plugins, disable_admission_plugins, quirk, tags, disable_api_termination, cp_multi_az, dry_run, output, filename, profile, set_fields):
     """CLI command to create a new Kubernetes cluster with optional configuration parameters."""
     project_name, cluster_name, profile = ctx_update(ctx, project_name, cluster_name, profile)
     login_profile(profile)
@@ -443,6 +444,8 @@ def cluster_create_command(ctx, project_name, cluster_name, description, admin,
     if cp_multi_az is not None:
         cluster_config["cp_multi_az"] = cp_multi_az
 
+    apply_set_fields(cluster_config, set_fields)
+
     if not dry_run:
         _create_cluster(project_name, cluster_config, output)
     else:
@@ -466,8 +469,9 @@ def cluster_create_command(ctx, project_name, cluster_name, description, admin,
 @click.option('--output', '-o',  type=click.Choice(["json", "yaml"]), help="Specify output format, by default is json")
 @click.option('--filename', '-f', type=click.File("r"), help="Path to file to use to update the cluster ")
 @click.option('--profile', help="Configuration profile to use", shell_complete=profile_completer)
+@click.option('--set', 'set_fields', multiple=True, help="Set arbitrary nested fields, e.g. auth.oidc.issuer-url=value")
 @click.pass_context
-def cluster_update_command(ctx, project_name, cluster_name, description, admin, version, tags, enable_admission_plugins, disable_admission_plugins, quirk, disable_api_termination, control_plane, dry_run, output, filename, profile):
+def cluster_update_command(ctx, project_name, cluster_name, description, admin, version, tags, enable_admission_plugins, disable_admission_plugins, quirk, disable_api_termination, control_plane, dry_run, output, filename, profile, set_fields):
     """CLI command to update an existing Kubernetes cluster with new configuration options."""
     project_name, cluster_name, profile = ctx_update(ctx, project_name, cluster_name, profile)
     login_profile(profile)
@@ -545,6 +549,8 @@ def cluster_update_command(ctx, project_name, cluster_name, description, admin,
 
     if control_plane:
         cluster_config['control_planes'] = control_plane
+    
+    apply_set_fields(cluster_config, set_fields)
 
     if dry_run:
         print_output(cluster_config, output)
diff --git a/oks_cli/project.py b/oks_cli/project.py
index 1b042a6..6c1e3b2 100644
--- a/oks_cli/project.py
+++ b/oks_cli/project.py
@@ -10,7 +10,7 @@
 from .utils import do_request, print_output, print_table, find_project_id_by_name, get_project_id, set_project_id, \
                    detect_and_parse_input, transform_tuple, ctx_update, set_cluster_id, get_template, get_project_name, \
                    format_changed_row, is_interesting_status, login_profile, profile_completer, project_completer, \
-                   format_row
+                   format_row, apply_set_fields
 
 # DEIFNE THE PROJECT COMMAND GROUP
 @click.group(help="Project related commands.")
@@ -188,8 +188,9 @@ def project_list(ctx, project_name, deleted, plain, msword, uuid, watch, output,
 @click.option('--output', '-o', type=click.Choice(["json", "yaml", "silent"]), help="Specify output format, by default is json")
 @click.option('--filename', '-f', type=click.File("r"), help="Path to file to use to create the project")
 @click.option('--profile', help="Configuration profile to use", shell_complete=profile_completer)
+@click.option('--set', 'set_fields', multiple=True, help="Set arbitrary nested fields, e.g. auth.oidc.issuer-url=value")
 @click.pass_context
-def project_create(ctx, project_name, description, cidr, quirk, tags, disable_api_termination, dry_run, output, filename, profile):
+def project_create(ctx, project_name, description, cidr, quirk, tags, disable_api_termination, dry_run, output, filename, profile, set_fields):
     """Create a new project from options or file, with support for dry-run and output formatting."""
     project_name, _, profile = ctx_update(ctx, project_name, None, profile)
     login_profile(profile)
@@ -230,6 +231,8 @@ def project_create(ctx, project_name, description, cidr, quirk, tags, disable_ap
 
     if disable_api_termination is not None:
         project_config["disable_api_termination"] = disable_api_termination
+    
+    apply_set_fields(project_config, set_fields)
 
     if not dry_run:
         data = do_request("POST", 'projects', json=project_config)
@@ -295,8 +298,9 @@ def project_delete_command(ctx, project_name, output, dry_run, force, profile):
 @click.option('--output', '-o', type=click.Choice(["json", "yaml"]), help="Specify output format, by default is json")
 @click.option('--dry-run', is_flag=True, help="Run without any action")
 @click.option('--profile', help="Configuration profile to use", shell_complete=profile_completer)
+@click.option('--set', 'set_fields', multiple=True, help="Set arbitrary nested fields, e.g. auth.oidc.issuer-url=value")
 @click.pass_context
-def project_update_command(ctx, project_name, description, quirk, tags, disable_api_termination, output, dry_run, profile):
+def project_update_command(ctx, project_name, description, quirk, tags, disable_api_termination, output, dry_run, profile, set_fields):
     """Update project details by name, supporting dry-run and output formatting."""
     project_name, _, profile = ctx_update(ctx, project_name, None, profile)
     login_profile(profile)
@@ -326,6 +330,8 @@ def project_update_command(ctx, project_name, description, quirk, tags, disable_
                 parsed_tags[key.strip()] = value.strip()
 
         project_config['tags'] = parsed_tags
+    
+    apply_set_fields(project_config, set_fields)
 
     if dry_run:
         print_output(project_config, output)
diff --git a/oks_cli/utils.py b/oks_cli/utils.py
index fd800f2..0ef7a66 100644
--- a/oks_cli/utils.py
+++ b/oks_cli/utils.py
@@ -1070,4 +1070,80 @@ def format_changed_row(table, row):
 def is_interesting_status(status):
     """Check if status is in the list of interesting statuses."""
     interesting_statuses = ["pending", "deploying", "updating", "upgrading", "deleting"]
-    return status in interesting_statuses
\ No newline at end of file
+    return status in interesting_statuses
+
+def normalize_key_path(key_path: str) -> str:
+    return re.sub(r'\[(\d+)\]', r'.\1', key_path)
+
+def parse_value(value):
+    value = value.strip()
+
+    # Inline list: [a,b,c]
+    if value.startswith('[') and value.endswith(']'):
+        inner = value[1:-1].strip()
+        if not inner:
+            return []
+        return [parse_value(v.strip()) for v in inner.split(',')]
+
+    if value.lower() == "true":
+        return True
+    if value.lower() == "false":
+        return False
+
+    try:
+        return int(value)
+    except ValueError:
+        pass
+
+    try:
+        return float(value)
+    except ValueError:
+        pass
+
+    if ',' in value:
+        return [parse_value(v) for v in value.split(',')]
+
+    return value
+
+def apply_set_fields(target: dict, set_fields):
+    for field in set_fields:
+        if '=' not in field:
+            raise click.ClickException(
+                f"Malformed --set argument: '{field}' (expected key=value)"
+            )
+
+        raw_key, value_str = field.split('=', 1)
+        key_path = normalize_key_path(raw_key)
+        key_parts = key_path.split('.')
+        value = parse_value(value_str)
+
+        current = target
+        for i, part in enumerate(key_parts[:-1]):
+            next_part = key_parts[i + 1]
+
+            is_index = part.isdigit()
+            next_is_index = next_part.isdigit()
+
+            if is_index:
+                idx = int(part)
+                if not isinstance(current, list):
+                    current_parent = []
+                    current[:] = current_parent  # if needed
+                while len(current) <= idx:
+                    current.append({})
+                current = current[idx]
+            else:
+                if part not in current:
+                    current[part] = [] if next_is_index else {}
+                current = current[part]
+
+        last = key_parts[-1]
+        if last.isdigit():
+            idx = int(last)
+            if not isinstance(current, list):
+                current[last] = []
+            while len(current) <= idx:
+                current.append(None)
+            current[idx] = value
+        else:
+            current[last] = value
\ No newline at end of file