Jelllyfin + Subfin (github.com/williamkray/subfin-plugin) works well, I’ve been using it with the OpenSubsonic Android apps listed in www.navidrome.org/apps/?platform=android&api=open… without issue. e.g. Substreamer, Tempus, Airdrome, etc. all work fine with Jellyfin + Subfin.

I’m guessing you’re not on Android since Jellyfin has an Android app, but you should be able to use any Subsonic/OpenSubsonic app once set up with the plugin.