It seems that the current list of Google fonts that Bootstrap Studio is “aware of” is somewhat behind the current number of actual Google fonts. Bootstrap Studio Design > Fonts > (right click) > Manage Fonts brings up the Google Fonts import dialogue, and shows a total of 991 fonts.
The actual Google Fonts website currently lists 1011 families.
Specific example: Source Serif Pro. Bootstrap Studio only lists 3 styles for this font when in fact there are 12 styles available on the Google Fonts website.
I presumed this was a sort of “live” connection to Google Fonts, but I guess not, so just bringing it to the attention of the devs. @martin