You can add fonts when editing text in the Design section. At this time, only Google fonts are able to be imported into Woobox.
You can import a Google font in the Styles tab, or in the toolbar at the top of the screen after selecting a text element.
To import a font, click the Styles tab, then click the + icon next to the current font.

Next, start typing a google font name and select the font you want when it populates.

Now it’ll be in your list of fonts and can be used in your offer.

Alternatively, you can click on a text element, and import a font using the + icon in the toolbar at the top of the screen.

Here’s Google’s site with their font previews and names: https://fonts.google.com/