He runs Jellyfin straight up from the downloads page [1]. I'm not entirely sure if it runs on Rosetta but he hasn't had any issues with multiple streams. For storage you have a couple options but enabling file sharing on macos + a large drive of your choice is your best bet.
If anyone wants to try this, be wary of transcode acceleration / HW passthru with Docker, esp on M1/M2. In general I’d love it if there was a GUI-less stripped-down MacOS Server edition instead of running the full-fat consumer OS as an always-on server.
[1] https://jellyfin.org/downloads/macos