I am researching how best to write an app. A requirement is that the 3D game engine is not loaded first thing, and assets and API communication are handled in Android/Kotlin code. The game will be just one Activity in the app. Scripts and assets must be handed off from the app to the game engine at runtime, and some in-game events must call app methods. Is there an example of how to do this with Unity, or is this use case not supported by Unity?