I am very pleased that as of 2021.12, there is an official Jellyfin integration. However, it only currently supports audio streaming/casting, and for my personal Jellyfin server, I overwhelmingly have video content that I would like to be able to stream video as well.
I have searched various forums and chat rooms for a request like this, but have found nothing, so just wanted to get it “on the books” and see if anybody knows if this feature is under development or planned already. I understand that the upcoming release of Jellyfin has a lot of improvements and fixes, so perhaps that will help feed into a more capable Integration for Home Assistant in the future.
Thanks!