How to pass sparse matrices to MLModel?

I have a XGBoost.Booster which recieves a sparce matrix returned by FeatureHasher. There is no feature names. How to convert this type of model to CoreML and how to pass an array to that model?

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Looks like model asks FeatureProvider for a feature only once. That means that features are hashed and threre is no sence in optimising the FeatureProvider.

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