Suggestion

I would like to add the mod to make raids harder, however I don't want the extra structures to spawn in the world.
It would be cool if you could add a configuration that allows to toggle if structures spawn or not.

You can find all the information you need here:
https://minecraft.wiki/w/Data_pack#pack.mcmeta
https://minecraft.wiki/w/Java_Edition_22w11a#General

Sounds good! Can you provide an example datapack? Maybe I'm doing it wrong but I am not able to prevent the structures from spawning.

You can do that with a data pack, possible the filter section feature.