[New API] Creating a custom flat world generator

Hello,
Now that the PM flat world finally works, I want to make a custom flat world generator.
How can I set a stone block at the height of 100, for example, every 4 chunks?

Don't know what you mean. Please, explain more.

I want to create a custom flat world generator and set a stone block every 4 chunks

It was possible for years now, but they now also even added a config option for this in pocketmine.yml

I want to do it from a plugin and not from PM

Custom generator plugins have also been around for ages in PocketMine.

Eg @shoghicp's SkyGrid plugin.

Don't worry I solved