Hinge or Generic constraint angle in rigid body simulation (render mode) / animation

Hello Blender Python Experts,

I have a model with a couple rigid bodies connected via hinge, generic, ball and motor constraints. The model works quite well.
Now I want to write the joint angle (motor or hinge angles) to a file or send the data via PySerial to a computer serial interface.
Therefore I want to read the hinge (or generic) constraint angles during the simulation/animation via a Python script.

The problem is that I could not find a method how to read the current simulated angles from the constraints.

Actually it is only possible after baking the simulation.

Is there a (hidden) method how to access the angles during simulation/animation?

Best regards
Thomas