It depends on how in depth you want to get.
Can the bottom piece be removed? If so, you could get a piece of 1/2" or 3/4" plywood cut to size. Take the og piece into a paint shop and have them match the paint and paint it.
I don’t recall the name of the product, I think it was someone on here in the arcade thread, but they painted with a paint that gave a plastic-y texture feel that might match the rest.
[edit] @KC-Slater was who I was thinking of in the arcade thread, but it looks like they may have gone vinyl instead of paint also?
I guess it depends on if the bottom piece can be removed and how much you want to get into it. If it can’t, you could sand the more chewed corner, mud the exposed mdf and paint. It wouldn’t be 100% symmetrical then but it would be coated. Idk, a bunch of options really, just depends on how nice you want it to look and how much effort you want to put into. Heck, you could go tupac style and glue down a cut to size bandana on it, lol.