I am actually quite excited about the return of @kde's #Amarok media player. It was my media player of choice in the mid-2000's and made it possible for me to sync my iPod up to the music library on my Linux desktop.
I'm currently a #Strawberry user, but I have always missed Amarok.
3.0.1 (beta) is out now. There's definitely work to be done, but I should consider reading up on KDE's Testing/QA process to see if there's anything I can do to help.
Amarok on Linux Mobile with Jellyfin integration would be a fantasy scenario. I have no idea if that is realistic though.