Merging of world file formats between Java and Bedrock

It would save some time and people poking around making 3rd party tools to extract/decompile your game assets to make world converters if both Java and Bedrock used the same data sets. I am not looking for the ability to play Java on Bedrock or vice-versa. I am looking for the ability to transpose either world files to either version without a 3rd party conversion.