Can fat grafting to breasts cause regeneration of nerve endings to regain sensation after previous surgical breast procedure?

I had mastopexy in 2015, my left breast had dehiscence at invented T, took 4 months to granulate in and close, and,amazingly,healed well enough that I decided it did not require a revision. However, I had a numb left nipple and part of left breast. 6 wks ago I had 300 ml fat grafting to both breasts for upper pole fullness--- and now I'm having sensation returning to the left nipple. I'm thrilled, I haven't seen this mentioned. Am Is there some science behind this?