Populate tflite metadata from json file

is it possible to input a json file as the INPUT to the metadata populator?
I see how you can output and visualize to json but does it work the other way?

MetadataPopulator can be used to populate metadata and model associated files into a model file or a model buffer (in bytearray). It can also help to inspect list of files that have been packed into the model or are supposed to be packed into the model.