Get a list back of system fonts

It would be very useful to know what system fonts exist on a device. If Qt could return a list with their names it would be a lot easier to know what fonts I can design for. It also would make it easy to debug problems. Say I think there is a font called "QML Sans", but really the name is "QML Special Sans". Getting a list back would make it crystal clear how the name is spelt for font.family and also let people know what fonts they have at their disposal.