[1.19.2] WorldGen only generate blocks at center of chunk

I want to make replace all the blocks that is not center of chunk with air. For ex. all the blocks in a chunk will be replaced by air except blocks that chunk position is [0 <y> 0]

I used Mixins for WorldGenRegion class and i successfully did what i want to do with structures and features. But I want to replace all blocks not just structure and feature blocks. 

How I can do that? Which class should I modify to achieve this?