Is there any way to make custom UI component type?

Is there any way to make custom UI component type?

I’ve found the uiComponent list like

  • toggle / slider / sensor / thermostat / media / color / battery / picker / ternary / button / null

But what if I want to make own UI component type not in the list, what can I do?

No, you cannot.
Simply put, because you would not be able to modify the Homey Mobile app, there would be no point.