I doubt that this is possible - bone can mend, but it is hard to grow or loose bone when it comes to the outer shape of it once you are an adult. Also, if HRT is working, even if there would be some regrow of bones, it should regrow in a feminine patterns. Some say, if you have working HRT with all , estradiol, progesterone, enough vitamins and working thyroid glands and all that, the bone may even change towards female patters over decades - too long to wait for it, of course, but some claim their bone structure already changed after 10 years - sadly few trans people get a really great hormone therapy, often it is combined with spiro, estradiol pills, low dosage estradiol, lack of progesterone, no check on vitamin D and B12 and no check on thyroid hormones or cortisol or IGF1, so such changes would probably be rare