[
  {
    "generator": {
      "condition": {
        "below": {
          "name": "minecraft:grass"
        },
        "chance": 0.1,
        "not_adjacent": {
          "name": "minecraft:tallgrass"
        }
      },
      "grass": {
        "name": "minecraft:tallgrass",
        "type": "tall_grass"
      }
    }
  }
]
