Feature Request: Support local files as playlist URLs

[upthorn]

Currently, there is no way to collect multiple videos as a TV Collection if a site's video collections aren't directly supported by yt-dlp

I would like to be able to provide a text file with a list of URLs to be interpreted as a playlist by ytdl-sub in order to cover such instances.

For example, Patreon has a video collection feature that is not currently supported by yt-dlp extractors. I'd like some work around to be able to season by collection like with a youtube playlist

As an example for how such a subscription might work:

Chrono:
  = Reactions:
    "Patreon Channel Name":
      s01_name: "Collection 01"
      s01_url: Collection01_URL_List.txt
      s02_name: "Collection 02"
      s02_url: Collection02_URL_List.txt

Would then treat each line of each provided text file as a URL to have yt-dlp handle