A dvr for YouTube subs (with sponsorblock) would be awesome
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Tubesync has you covered
Wow. Thank you. Don’t see SponsorBlock support. Looks like it still may be possible this way though: https://matthewhall.com/posts/adding-youtube-subscriptions-to-plex/
It's in there:
I stand corrected. Thank you for sharing!
I don't know anything about jellyfin so no idea if this actually fits your requirements, but hosting your own invidious instance would give you a YouTube web interface which you could use to watch directly or download for later.
For what it's worth, emby does pull YouTube data in for me, as I have a few YouTube video series in my erm media folder and was surprised it automatically brought the metadata. So jellyfin might have something similar built in.