Chord font

From the menu Format->Style->Text Styles(this is the last entry)->Chord Symbols.

But, if the idea is you want a "handwritten" font, best to simply use one of the Jazz templates when you first create your score - then it will use the jazz fonts for everything, not just chord symbols. Or if you've already started a score using a different template, you can use Format / Load Style to load the jazz style.