How to generate ores in other dimensions than Nether /Overworld

How to generate ores in other dimensions (like End)?

Do I have to edit the code of a specific block to make it generate in End? If that's the case, please tell me how to, because I already tried (I checked "Generate in Nether" and relpaced "generateNether" by "generateEnd" in the code and it doesn't work... (don't judge, I'm don't know Java))

Thanks.