They aren't really related skills, other than the fact the the ball is hurled at the hoop for both, they are rather dissimilar.
So if it is implemented, it should be possible that any player/position are trained in jump shot have their FT ability trained as well, only very, very slightly. Perhaps so slowly that it isn't very notable at all; i.e. 8-10 weeks of jump shot for one level of FT. It wouldn't be much of an advantage in the short run, but as a player became a better shooter overall, he would slowly increase his FT shooting.