Word Add-in: Would like to be able to list available fonts from Office.js

Scenario:  We would like to enable our customers to set the font style (font name, size, etc...) for certain types of text (i.e. AI generated vs. human created).  We couldn't find a way to do this from the Office.js API. 

Please let us know if there is a way to do this currently or if not, we'd like to request this as a feature.   

Additionally, is there a fixed minimal set of fonts that we can assume will always be present when Word is installed (Desktop) on Windows and Mac?

Thanks!