If you want to extrude the font, Fusion 360 currently only supports the use of TTF fonts. If you just want to add a custom font to Sketches then you can also use OTF fonts.
TTF, which stands for TrueType Fonts, is an outline font standard developed by Apple in the late 1980s. Today, it is the most widely supported font format for both macOS and Microsoft Windows operating systems. [Read more...] about How to Use Custom Fonts in Fusion 360