Just place the Include HTML component on the form. Change Include type to be: Include from text and add there the string you get from Google fonts, for example:
<link href='http://fonts.googleapis.com/css?family=Vampiro+One&subset=latin,latin-ext' rel='stylesheet' type='text/css'>
Now you can set any of the components on the form to use the font (Vampiro One) defined above.
See the example from the attached project.