Networking one docker container to another?

I've been tossing around ideas on how to do this all day and haven't come up with anything simple.

I am trying to setup a reverse proxy to access a service at my house. However I already have a service running on port 443 at home, and this service cannot run on any other port, and it cannot function behind a reverse proxy, so its pretty much taken over port 443 and I cant do much about it. 

I have another unraid server at a remote location that doesn't serve anything on ports 80 or 443. So My thought was to setup the reverse proxy on that machine, and then use ZeroTier to VPN the remote server to my home network. 

So basically;

URL----->Reverse Proxy----->Zerotier(VPN)----->Service running at home.

I plan on using NginxProxyManager along with ZeroTier for tunneling. 

I originally thought about Loading up an UbuntuVM on the remote unraid server, but then I realized I have absolutely no idea how to use Docker outside of UnRaid. And it also seemed silly to create a whole VM just to do this. 

So how can I get NginxProxyManager container installed with an IP from my network so that I can port forward to it, while also telling it to tunnel its traffic through the ZerTier VPN? I know its doable, but I just don't know how.