End Generation without main island?

Hi, I am working on a MCreator mod that adds a new dimension with the end generation, but there's a problem... it just spawns me on one big island/the main island. I've been looking for hours and found no posts or videos or anything really on how to solve this, with the only options being something with the json code (which doesn't even work for me and tells me to load "safe mode" when creating a world) or making the islands and exporting them as structures which i DONT want to do since i'm, well, trying to make them spawn naturally...

Preferably, I'd like a solution that doesn't rely on:

Locking elements (i modify stuff pretty often + i also sometimes change between versions and generators etc etc)

"Structure" islands because I want very big naturally generated islands, like the ones on the Aether or the End

But any help is appreciated nontheless....