I found this tutorial to be quite helpful and have used the reverse proxy stuff from here to also set up reverse proxy for immich and photoprism.
https://www.linuxcapable.com/how-to-install-jellyfin-media-server-on-linux-mint/
Took me a few tries though, especially getting the valid config AND SSL certificate in the correct order…
1 2 3 … to change sections hotkey doesn’t work btw