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Re:Apple Create ML: Creating an Image Classifier Model by mumblemumble on Monday November 30, 2020 @10:28AM (#25254723)
It's not a pre-existing standard, but it is a documented format. It's based on protocol buffers, so I would expect it's fairly easy to write your own reader if necessary.

https://apple.github.io/coremltools/coremlspecification/

Re:Apple Create ML: Creating an Image Classifier Model by Someone on Monday November 30, 2020 @11:47AM (#25255767)
That project also has code for converting from quite a few formats (https://coremltools.readme.io/docs) to CoreML.

Having that (3-clause BSD-licensed) code will help in writing the reverse converters.