Multiple web search enignes and a youtube engine

[salahoued]

When using multiple websearch engines it would be much better to have an indicator for each engine displayed, like having the name (an icon would be better) of engine added to search query:

Websearch | DuckDuckGo: anyrun
          | Google:  anyrun

And I'd like to add a Custom/Youtube engine:

Custom (
  name: "Youtube",
  url: "www.youtube.com/results?search_query={}"
)
engines: [DuckDuckGo, Youtube]

when using the config it seems the plugin doesn't work anymore.
Here is my websearch.ron

Config(
  prefix: ":ws",
  // Options: Google, Ecosia, Bing, DuckDuckGo, Custom
  //
  // Custom engines can be defined as such:
  // Custom(
  //   name: "Searx",
  //   url: "searx.be/?q={}",
  // )
  Custom (
    name: "Youtube",
    url: "youtube.com/results?search_query={}",
  )
  //
  // NOTE: `{}` is replaced by the search query and `https://` is automatically added in front.
  engines: [DuckDuckGo, Google, Custom]
)