Custom fonts for use in your apps can be managed via the Design > Fonts page:
How to Use
To add a new font, tap the "+ CUSTOM FONTS" button in the upper-right corner. You will be prompted to upload a new font:
TrueType (TTF) and OpenType (OTF) font formats are supported.
Once your fonts have been uploaded, you may choose which fonts should be applied to the "primary" and "secondary" text elements within the apps. Primary text elements principally includes playlist and content titles, and secondary elements include text shown for the subtitle, duration, rating, publish date and description metadata fields.
To remove a font from your application, use the "Delete" action shown on the row that represents the font in the font list.