Isn't that mylar covering the plastic? Can you rechrome plastic? Or do you mean re-mylar it? (Is there such a thing?)
I used to own a 66 (Mustang) coupe and the mylar peeled off my instrument bezels so I used chrome paint and a small brush and painted it all. It took forever! (That was when I was younger and had more time). It turned out nice but it wasn't as shinny as the original mylar.