as it is right now, holesail is essentially a server, so it takes implementation on both ends. you are wanting the zeus app to create the tunnel from the outside without any server side implementation?
You need to implement holesail-client / holesail-server in Zeus wallet using Bare-kit. I have a working example of it here https://github.com/supersuryaansh/hyperclip-android/
We are already working on the other side of it. We just don’t have it in a mobile wallet yet.