@mattly I have! It was a giant pain in the butt. Although that was like 90% my own fault.
The short version is https://www.tubearchivist.com/ downloading into a shared volume with jellyfin, and then https://github.com/tubearchivist/tubearchivist-jf-plugin to let JF use TA as a metadata provider.
(The hard part was container networking)
In this setup, YT channels become tv series, and every year is a new season. It seems like playlists could be seasons, instead, but 🤷♀️