You can add a custom font style to the text on your form on specific pricing plans.
Go to Theme & Appearance → Typography → and select "Add Custom Style Group +."
Adding a custom style allows you to customize the font size, typeface, weight, line height, and color of specific text on your form.

To apply the custom font style to your text, highlight the text on the form and click the arrow that shows up at the end of the options to select and apply the custom style.

Gotchas
- You can only apply a custom font style to text that can be highlighted in order to customize.