How to make a class and data model diagram of a Unity 3D game?

Hello,

For my software engineering class I've been developing a small platformer videogame on Unity 3D. I've been asked to present the class diagrams and to present a data model of my software, which in this case would be my videogame. If I'm not mistaken Unity uses an entity-component-system, which necessarily doesn't use heritage. How would a class diagram from a Unity game look like? It would really help me if someone could show me an example so I could understand better.

Also, I've been taught that usually data model refers to entity-relationship-models that represent a database. In the case my game doesn't use a database, how could I diagram the way the player's data is store on the game?

Thanks!