Sketch CMakeList.txt is there an easy way to lookup entries extracted from boards.txt?

[TobyChaloner]

In a Sketch CMakeList.txt is it possible to lookup entries in the boards.txt as specialised by the file BoardOptions.cmake.
For example I want to lookup the page size and start address for creating a filesystem via mkspiffs (or mksmallfs).

The section of boards.txt I am interested in looks like. This is for 1M64 flash.

generic.menu.eesz.1M64=1MB (FS:64KB OTA:~470KB)
generic.menu.eesz.1M64.build.flash_size=1M
generic.menu.eesz.1M64.build.flash_ld=eagle.flash.1m64.ld
generic.menu.eesz.1M64.build.spiffs_pagesize=256
generic.menu.eesz.1M64.build.rfcal_addr=0xFC000
generic.menu.eesz.1M64.build.spiffs_start=0xEB000
generic.menu.eesz.1M64.build.spiffs_end=0xFB000
generic.menu.eesz.1M64.build.spiffs_blocksize=4096