[
  {
    "condition": "minecraft:entity_properties",
    "entity": "this",
    "predicate": {
      "location": {
        "dimension": "minecraft:overworld"
      },
      "equipment": {
        "feet": {
          "predicates": {
  "minecraft:custom_data": "{armor:\"mushroom_boots\"}"
      }        }
      }
    }
  }
]
