Support pack uri

[ajaywhiz]

Is your feature request related to a problem? Please describe.
I don't want to expose json file on to the user's files system.

Describe the solution you'd like
Would be good if the library could support reading the json from app's resource i.e. pack URI.

Describe alternatives you've considered
The other way is to write additional code to read json from resource and pass it to the library.

Additional context
Add any other context or screenshots about the feature request here.