Somehow use mapy.cz (app) data for Locus use

When you download offline data for mapy.cz application, it saves these data on your device in .br4 format. Maps and Poi, each region in separate file.

Downloading by using paths in map providers xml is workable, but heavy handed approach, whole Czech Republic up to maximum zoom would take 100+GB of space, where in offline data from mapy.cz app it takes under 1GB.

I understand it may not be possible to use that data. That it's proprietary format or something. But if it could be done, it would be life saver.