Check out https://siloserver.org . Silo has its own API but also spins up a Jellyfin-protocol compatibility layer. This allows you to use any Jellyfin client and just point it at your Silo server.
It's currently running a PB+ media library (which neither Jellyfin nor Emby can run) with native clients across multiple platforms. It will unseat Jellyfin.
You mean the one guy who prompts Claude?