How to save model for ONNX and Keras after bentoml 1.4

[cceasy]

Hi @frostming I noticed that onnx and keras were marked as deprecated, and there is no alternatives in the log, I also check the office document, no alternatives found. Can you please tell me how to handle onnx and keras models, thank you in advance.
https://github.com/bentoml/BentoML/blob/v1.3.10/src/bentoml/__init__.py#L178-L189

[aarnphm]

check bentoml.models.create