{
  "feature": {
    "type": "simple_block",
    "config": {
      "to_place": {
        "type": "simple_state_provider",
        "state": {
          "Name": "minecraft:pale_moss_block",
          "Properties": {}
        }
      }
    }
  },
  "placement": [
    {
      "type": "environment_scan",
      "direction_of_search": "down",
      "max_steps": 2,
      "target_condition": {
        "type": "matching_block_tag",
        "tag": "nova_structures:pale_moss_grows_on"
      },
      "allowed_search_condition": {
        "type": "matching_block_tag",
        "tag": "nova_structures:moss_spreads_over"
      }
    }
  ]
}