I don't think it's practical. Sure, you could install termux and use that to run Jellyfin, but you won't have a pleasant time.
The better play is, to play spend 30 Bucks on a refurbished thin client and use that as your server. If you install Open Media Vault on there you'll never even have to touch the command line. (You'll have to install OMV-Extras on top of Open Media Vault for that).