Is there anyone out there using Core ML outside of an Apple environment? (outside Xcode)

Question

I'm starting to work with ML and before using either TensorFlow or PyTorch I'd like to use Create ML / Core ML (for its simplicity and UI) on a python script, for example.

I've tried to convert Core ML to ONNX, but apparently ONNX won't keep supporting Core ML. I've also tried to use coremltools to make my model work in a python code, but did not manage to make it successfully.