View in which playlists a channel exists

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I have read and understood the AI policy. The content of this request is not generated by AI.

Feature description

Add the ability to view in which playlists a given channel exists.

Why do you want this feature?

To simplify organising channels and make this task much easier.

Additional information

When holding a channel, currently displays 3 options:

1. Share
2. Open in browser
3. unsubscribe

I suggestion to add another section that would make organising playlists much easier:

4. Playlists in which this channel exists.

Like this, it becomes easy to find which channel isn't added to any playlist, and in which playlists a given channel exists.