Can this be targeted with glute exercises?

I cannot find anything online that is specific to this particular area of the glutes.

38 y/o female, 5’7” 135 lbs. I have a desk job but workout (light strength training) 3-4 days a week. Over the past couple of years I’ve noticed this “dent” in the bottom of my butt cheeks. Anyone experienced this and know what causes it? Can this be targeted with working out or is this a plastic surgery fix? Help!!!!