[APP][Pro] PV Forecast: solar forecast that measures your roof and learns from your panels

Great idea!
Two questions:

Will you open source the app? It needs full access, understandable, but we can’t see for ourselves what it’s doing.

What capability is used for the prediction? I have the [App][Pro] Homey EMS (HEMS): Smart EMS by @Kaoh installed and the Solar Forecast device is not selectable as a forecast source in that app.
This is what that app looks for:

Thanks!