IPC API Kicad 9 create a rules area

Hello,
I just starting to explore the Kicad 9 IPC API. So far I could run the provided python examples.
The very simple example create_zone.py (more a script as a plugin) is a very good example how to create a copper zone on the actual board from a external interface. Which is the half of them what I need.
I had also a closed look to the documentation and from that, it should be possible to define a zone also as a rules area (same as in the gui) but I was not able to finde a property or a methode to do so. Hope somebody could give me some hints.
Best Regards

Could somebody help me with that issue?
Also a hint to the a more detailed description of the API would be helpful for me.