Comment 1 for bug 119174

Yes, I agree that would be useful. HOWEVER, Gnome Specimen can only show fonts that can be retrieved using GTK+/Pango/Fontconfig, which implies the font should already be installed (and "configured" in fontconfig, i.e. put in the a directory that is in the search path). While fontconfig cannot be configured dynamically (it uses XML configuration files) and Freetype cannot be directly invoked from Python I see no possibility to have this feature...