It would be nice to try a hidden test area. There are tons of how to's floating around.
I'd consider cleaning well with something that leaves the current finish alone and doesn't leave a residue. There's a fair chance, that if it's lacquer, then lacquer thinner will soften the current finish. Maybe, one of those small artist brushes can pick up a little thinner and blend old finish evenly over the chip. That may be all it takes.
If the lacquer thinner softens the finish and you want to add more finish, I'd try to track down a nitro cellulose based lacquer. Go as quick as you can laying it down, a little irregular is okay. Then do the careful blend again after it seems to set. Best of luck with it.
