u/LU53RRR

I was able to get jellyfin videoplayback working on CarPlay, with the APTV app in the App Store.

Please be sensible and use only when the car is in park!

Guide:
After downloading APTV, connect to CarPlay and open the APTV app on the CarPlay screen. Hop over to the "quick" tab, select the browser option and visit your jellyfin server URL.
I recommend saving the page as a bookmark
AFTER you log in to your jellyfin for easy access and so you don't have to keep logging
in.