It's hard to tell how deep it's been ground down in the pics but I'll put in my 2 cents. On mine the previous owner used a light glass with polyester resin. I was able to actually peel the whole thing off by hand because they didn't even sand the gelcoat. After grinding it a bit I thickened some epoxy with fumed silica and 1" strand of loose glass. I spread it over the affected area and let it cure before sanding it to shape. In the past I tried patch smallish gouges with cloth but found myself sanding most of it off trying to make it look good. I'm guessing you don't have access to the inside but if you did, I would suggest adding the cloth there.
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