My 16 has issue in the same place. I too am curious if it can be fixed. I'm thinking we'll have to live with it. I was planning on waiting until it gets really bad and then replacing the front seat covers with real leather.My 15 gt premium also has two cracks on the drivers side left bolster.
FWIW, I read the bolsters are not leather.If you have cracks or tears, the damage is already done. When leather dries out, you will get cracks and tears. Treat your leather seats/ trim with a good quality leather conditioner at least twice a year and you should be good.
With that being said, a good upholstery shop can remove a bad panel and sew in a fresh leather replacement panel.