It is possible if you know coding but as we understood, you were asking for an option for more fonts than 2 and such option does not exist. If you look under Theme options > Fonts > Custom section, you will see that we have an option to use only 2 custom fonts.
Yes, this is true but this requires files customization what in reference to Item Support Policy is not allowed. For any files customization is responsible web developer who is creating final website.
Comments
we are sorry but it is not possible to use more than 2 custom fonts.
Thanks!
Anyway, we are glad to know that you did it.