Hi,
You can use any TTF. See the post on Ludei's website in the blog section:
blog.ludei.com
True type fonts: CocoonJS now can render text using a true type font file that you can provide inside a folder called ?fonts? among your assets.
So when C2 has created a ZIP, then you add a folder inside that ZIP called "fonts" and copy the ttf into that folder. Doesn't work on Android yet.