Unfortunately, that won't help me in my situation. I know how to take MV formatted tilesets and convert them to VX Ace. But a json file will not help me here because VX Ace does not use json files.
Even my expertise in graphic design along with what I learned in college could not fix this. I was able to salvage the trees and objects and make a B tileset out of them, but the ground and water, I can't fix into the right format.