How would i disable diamond ore generation but ONLY in the overworld

[steady hinge]

Self explanatory, i am very in experienced with scripting but am trying to learn

[short edge]

Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

[sharp raptor]

According to the wiki:

WorldgenEvents.remove(event => {
  // print all features for a given biome filter
  event.printFeatures('', 'minecraft:plains')

  event.removeOres(props => {
    // much like ADDING ores, this supports filtering by worldgen layer...
    props.worldgenLayer = 'underground_ores'
    // ...and by biome
    props.biomes = [
      { category: 'icy' },
      { category: 'savanna' },
      { category: 'mesa' }
    ]

    // BlockStatePredicate to remove iron and copper ores from the given biomes
    // Note tags may NOT be used here, unfortunately...
    props.blocks = ['minecraft:iron_ore', 'minecraft:copper_ore']
  })

  // remove features by their id (first argument is a generation step)
  event.removeFeatureById('underground_ores', ['minecraft:ore_coal_upper', 'minecraft:ore_coal_lower'])
})

There is also

onEvent('worldgen.remove', event => {
  event.removeOres(ores => {
    ores.blocks = [ 'minecraft:coal_ore', 'minecraft:iron_ore' ] // Removes coal and iron ore
    ores.biomes.values = [ 'minecraft:plains' ] // Removes it only from plains biomes
  })

[steady hinge]

Where would the file go and what would it be named?

https://kubejs.com/wiki/tutorials/1.20.1-worldgen#specific-ores

this is all i could find