minecraft-assets/data/minecraft/worldgen/template_pool/bastion/blocks/gold.json

{
  "elements": [
    {
      "element": {
        "element_type": "minecraft:single_pool_element",
        "location": "minecraft:bastion/blocks/air",
        "processors": "minecraft:empty",
        "projection": "rigid"
      },
      "weight": 3
    },
    {
      "element": {
        "element_type": "minecraft:single_pool_element",
        "location": "minecraft:bastion/blocks/gold",
        "processors": "minecraft:empty",
        "projection": "rigid"
      },
      "weight": 1
    }
  ],
  "fallback": "minecraft:empty",
  "name": "minecraft:bastion/blocks/gold"
}