Is it possible to get a better jawline definition with a placement of fat?

I wonder if it is possible to achieve a firmer, more defined jaw lines by fat transfer. Fat is a softer filler and when filling a place like the jawline, it is desired to mimic bone. Also, when people LOSE fat, they generally get a more defined jawlines. So I wonder if it is possible to get a better jawline definition with a placement of fat, and if so, how does it work.