I've succeeded but I've done it into Semantic Forms textarea fields, hacking Semantic Forms code, because that was my need. I suspect this is not what you want, by the way atm I don't have the time to reorganize the stuff and thoughts in a form it could be shared easily, by now it's just a hack. When I'll have time, I'll try to write a sort of tutorial to do the same hack, or better I'll try to let Yaron Koren include it in a future Semantic Forms release.