Forward Only One Port For Proxmox

I need serious help here, I have no idea how to do this. My idea is that i am only able to forward one port, 443, on my router. Weird, I know, but it’s what i have to work with. The issue is that I have 3 services that I need to be able to access through the outside network. I’m hoping to accomplish this with subdomains in some sort of way, so i could have proxmox.example.com go to the management panel for my proxmox server, jellyfin.example.com go to my jelly fin server, etc. Is there any way this can be done?