Filler in collarbone area? Is it safe? (Photos)

I have been thin my whole life but have no visible collarbones except in the tops of my shoulders. No fat covering my collarbones or anything, they just aren’t pronounced at all, though I can feel them quite well beneath the skin. Perhaps there is a posture issue? Either way, the issue is not fat. I love the look of (healthy-looking) projecting collarbones, and am curious if injecting fillers in this area has been done, if it’s safe, and who I should consult with to take the first steps.