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Jellyfin does allow you to import music and has its own library for it (it's pretty basic IMO though). For mobile streaming, I use Synfonium (Android) as a client and log into jellyfin from there There's also Navidrome which is a server and player and any app that uses subsonic can hook into Navidrome.
I guess I could keep buying them and sticking them on my zigbee network, but I should probably get off the Hue train before things get worse. The issue is that they're just amazing bulbs and I can't find a competitor with similar light and color tuning. Are there any comparable options yet?