Jellyfin web UI setup

i’m probably misunderstanding or overlooking something very basic, but i can’t seem to work out how to get Jellyfin’s web UI onto HTTPS.

as in, how do i import a custom TLS certificate for the jellyfin app container to use, and configure it to use same?

ideally i’d like the jellyfin app to listen to port 443 on its own static (or, in a pinch, even a DHCP-assigned) IP address, but i can tolerate having it on a nonstandard port on the NAS machine’s IP if needs must. just, i would much prefer to have it use HTTPS, and i’m unable to figure out how.