Sorry, saw this only just now. I don’t really have any guides to point to, so just the basic steps:

• host jellyfin locally, e.g. on 192.168.10.10:8096
• configure some reverse proxy (nginx, caddy, in my case it’s haproxy managed through OPNSense)
• that proxy should handle https (i.e. Let’s Encrypt) certificates
• it should only forward https traffic for (for example) jellyfin.yourdomain.com to your Jellyfin server
• create a DNS entry for jellyfin.yourexample.com pointing either to your static IP, or have some DynDNS mechanism to update the entry

90% of this is applicable to any “how to host x publicly” question, and is mostly a one-time setup. Ideally, have the proxy running on a different VM/hardware, e.g. a firewall, and do think about how well you want/need to secure the network.

In any case, you then just put in jellyfin.yourdomain.com in the hotel TV.