You can see the list of fonts available in your system in System Settings > Fonts.

And also here:

To upload new fonts, you need to a) have a suitable license to use the font and b) make sure its properties allow it to be ’embeddable’.

You can upload any Windows font or TTF, OTF, or Postscript font. The postscript fonts will require two files to be uploaded, usually a PFM and an AFM.

Please keep in mind that only the fonts you upload, will be embedded into editable product PDFs (not the pre-loaded system fonts)