Can I get the font metrics outside simulator? The fonts seem to be encrypted

The fonts used by simulator are here.

 ~/Library/Application Support/Garmin/ConnectIQ/Fonts

-rw-r--r-- 1 kent staff 29881 Aug 11 23:17 FNT_VIVOACTIVE4_ROBOTO_XTINY_BOLD.cft
-rw-r--r-- 1 kent staff 32 Aug 11 23:17 FNT_VIVOACTIVE4_ROBOTO_XTINY_BOLD.md5

How to get the font metrics outside simulator?

I wanna do somehthing like dc.getTextDemension(text,font) in my python script, but I cannot get the font or font ascent etc metrics. How to cope with this?