Ability to treat some playlists as channels with autorefreashing and presenting new videos on "what's new" tab

[ghvxx43696]

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.
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• I have read and understood the AI policy. The content of this request is not generated by AI.

Feature description

As in title. Please add ability to "subscribe" to playlists. The playlist content would be refreshed when checking for updates to other subscribed channels, and new videos on these lists would be added to the “What's New” tab.

Why do you want this feature?

Some channels publish videos from several categories. In order not to limit their reach, instead of running separate channels, everything ends up on the main channel. Some of them divide their activities by assigning uploaded videos to playlists that specify the category of the video. This allows you to follow only the part of the activity that interests you. Currently, you have to check each playlist manually to find out about a new video. The ability to treat them as subscribed channels would allow their content to be updated along with the channels and notify us about new videos in the What's New tab, as if we were subscribed to only part of the channel.

Additional information

An example of a popular channel that does this is jerryrigeverything.