Well, yes it's repairable.
My son had a huge dent in the top of the hood on his 70 GMC, where a tree branch landed on it. (About a 5" diameter end)
He pulled the hood and we discussed the possibility of heat shrinking and working the metal to flatten it back out and clean it up. Mind you...
Pics?
Maybe that explains my dent "up" from the inside on my hood from the PO.......
Yes, the dent can be fixed. Heat, hammer, and repaint, but if it's shallow enough one of those paintless dent removal placed can do it as long as they have access to it from the inside.