I believe TFLite Delegate logic is available only in C++ per TFLite Sources. Likely you would want to implement your inference code in C++ anyways as on VOXL your inference times will likely be much faster than in Python.
We have some example of assigning delegates inside our voxl-tflite-server source code, check out these lines: https://gitlab.com/voxl-public/voxl-sdk/services/voxl-tflite-server/-/blob/master/src/inference_helper.cpp#L216
Hope this helps,
Thomas
thomas.patton@modalai.com