Xcode 11 + CreateML - work with existing MLModels

Is it possible to "open" an existing .mlmodel file in CreateML, and then train with my own dataset?
Ex:

1- Download one of this MLmodel:
https://developer.apple.com/machine-learning/models/#image
2- Import in CreateML
3- Import my datasets and train
4- Export updated MLmodel
I've watched all ML WWDC videos so far but havent found this answear
Cheers!