I did similar with caddy. I own a domain and my server runs pihole and it is configured as DNS server. So what I did was setup caddy to create local subdomains that are only reachable through my network. For example: subdomain.mydomain.com , that works only from home. It works with ssl as well

Project zomboid

That works. I did it with a LG tv: Have a server advertising the routes with tailscale and in your tv when you configure the connection select that server as gateway and that’s it.