Is there any way I can naturally generate biomes in the end

That might work, but there is no way to naturally generate nether+end biomes yet with MCreator.  But, Klemen will see what he can do now that 1.16 is out :)

You could probably add some spreading blocks (end grass which turn near endstone into other end grass) to simulate end biomes, but it might cause some lag

You could also create some huge end-island structures that look like biomes

I need to do the same thing for my mod good idea

https://mcreator.net/forum/89076/how-make-end-biome-works   use this

@RaolTheBest https://mcreator.net/forum/89076/how-make-end-biome-works   hmm do you need to though https://mcreator.net/forum/89076/how-make-end-biome-works  hehehehehehehehhe..