Google Maps caching offline

Continuing the discussion from Cache Google Maps:

Is there any way to do this I have found a few apps that do cache google maps but I have not found out how to do this with ionic.
One example is NextTransit

I also have interest in question… do you have solved? Thank you

I have not solved it. Stack overflow has one resource that I still have to try. They say use caching. But I do not know where to do caching.