This is very much so a work in progress, but if you feel like trying it out and offering feedback at this early stage, that would help shape the direction this may all end up going.
Currently it only runs on Android (7.0 and higher) but an iOS version is possible depending on how much interest there is in this.
You can download the APK here.
To connect, enable hotspot mode on your Zynthian and connect your phone to its WiFi. That all, the app should auto connect.