Flutter offline map view - how to create Linker Address Map(.map) file for offline purpose?

Question

I want to show the map in offline mode. the package mapsforge_flutter is best for this purpose. We can download the offline map data from here to use it with the mapsforge_flutter package, but the problem is that the map data of some countries is too large. I want to use an Indian map, you can find it here and its size is 1.2GB. the project was unable to load the asset because of its size. is there any way to create a custom .map file from the map(Google Map, OpenStreetMap, etc.)