Changing The Font With Macros

I know about the font macro, but that only has limited fonts it can use. I was wondering if I could import the font in the stylesheet, then integrate it with a macro, like this:

(font: 'Dancing Script, cursive;')

Is this right, or is what I'm asking impossible. I know I can just change the font in the stylesheets, but I want two different fonts in the same passage. If this is not possible, could you please give me a list of all the fonts you can do with the font macro, and I'll see if I like them.

I use Harlowe.