Go to your local automotive store and pick up a Bondo Fiberglass repair kit. Follow the directions, but basically, for that small a hole, it won't take much. You won't need the nylon mesh that comes with it either.
Clean the affected area real good, mix the Bondo epoxy, and place a small dab right on the hole. You'll have about 5 or 6 good minutes to work with it before it starts hardening.
Directions say, after it hardens to sand it down with a fine grit sand paper and then repaint. I had a much larger crack and after sanding, the sanding caused a bigger noticeable blemish than the crack ever did. I ended up repainting the entire area. I could not color match it, which I tried. But the automotive parts store had a color that worked well with my color scheme. I also got a can of spray Gel-Coat and after 2 applications of the Gel-Coat, it looked ... well ... pretty darn good.
In your case, as small as that hole is, just put a dab of the Bondo Epoxy in the hole and call it a done day.
To plant a garden is to believe in tomorrow.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually