JSON model on ANDROID STUDIO using PYTORCH MOBILE

Hello,
I’m using a JSON model in Android Studio, using Pytorch Mobile. From this json model i need to extract features and later regarding the values of this features classify this input as good or bad using the JSON model.

I was checking on the demos available for pytorch mobile. In this demos the models have always the .pt extension instead of .json. Is this problematic for me? is it possible to chargw a json model instead of a .pt model? and later, to do the lite changes, I dont do this? As we have to extract features from the input is this possible using android studio, in java?