Add custom font to drop-down list (not Google-font)

Hello!
I read a lot of posts concerning the topic of adding custom fonts, and including google fonts into the drop-down lists works fine for me. However I did not find a clue or solution to adding a font to the drop-down list that is not a google font, e.g. a font that one included using @font-face.

Is that possible? I mean there is the function avia_add_heading_font but I am guessing this works with google fonts only?

I know it is possible and not hard to use a custom font through css, but I am a little bit unhappy with that solution- I mean, making it easy for any user was what the drop-down menu was for, right? :)

So, if there is a solution I would be thrilled, if there is none- bummer, but that would be fine.