Not really. The green grass you saw was just some fake chunks made by @bluelectric. Btw, @bluelectric seems to have quitted... I'm not sure if it is related to me refusing to merge code that was only for testing. Anyway, I asked for other developers' opinion on #mcpedevs and seems that everyone agrees that code for testing only (which skips the world generation part) should not be inside a pull request.
The format is not really hard, you just need to know "XZY" (or "YXZ"? I forgot . Hard thing is the generator AP . I mean the internal API.
