Voice assistant: atom echo and mini pdm microphone?

Hi,

I have been playing around with atom echo to replace my echo devices.
The builtin mic is pretty crappy, so I bought a pdm microphone - this can just be plugged in to the atom echo using a short 4-pin cable.
But how to get it working?
did anyone get it running and would be willing to share the pin configs in the yaml?
Best regards and thanks in advance,
Otto