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It could be as simple as converting the CUnet models (t7 or json) to coreml (mlmodel) format and replacing files.

If you wanted to convert the models yourself rather than request the developer do so, it looks like one of these tools may do it:
https://apple.github.io/coremltools
https://github.com/Microsoft/MMdnn
https://github.com/prisma-ai/torch2coreml