How to connect pie-hole docker to open vpn docker and unbound dns if possible

I have created a network as test- and gateway is

I have created a pie-hole in one docker - open ports are 80 from container to 1001 outside

I have created a open-vpn in another docker - open ports are 1194 from container to 1000 outside

I connected both docker to test network and removed bridge network.

So how to connect the pie-holeto open-vpn and how to use open-vpn file to connect to pie-hole network. Can i use unbound dns in another container and how to connect?