Hi there,
Unfortunately there’s way too many Google Fonts to list within the theme if we were to add all of them. Instead, we’ve only included the top 200.
However, you should be able to use their website to look through all of the available fonts (they have live preview as well, which the Customizer doesn’t have).
Then when you find one you like, you can choose it from the list, or add it using a filter if it doesn’t exist within the list.
Let me know if you need more info ๐