Of course you can use any font.
You need to place a .css file pointing to your font into the style directory (webcontent/eclntjsfserver/styles/<stylename>/myfont.css) and it will be automatically added into the client processing. then you may address the font either by your style (if you have an own one), or via "family" in the font definition of CaptainCasa componentes ("size:12;familyxx;weight:bold"...)