GUI on a Linux server

My home server is a Proxmox machine with some VM one of which is Open Media Vault from which a Windows PC plays videos to my TV. I want to get rid of the Windows PC and connect the TV directly to the server with an HDMI+USB RJ45 extender, but...how do I get a GUI from it? Is it even possible? I would need to connect to a Windows VM because for what I know Netflix only plays 4K videos with Edge. Thanks!