Generate podzol inside coarse_dirt patch

Here is the .json file
  "type": "minecraft:random_patch",
  "config": {
    "feature": {
      "feature": {
        "type": "minecraft:simple_block",
        "config": {
          "to_place": {
            "type": "minecraft:simple_state_provider",
            "state": {
              "Name": "minecraft:coarse_dirt"
            }
          }
        }
      },
      "placement": [
        {
          "type": "minecraft:block_predicate_filter",
          "predicate": {
            "type": "minecraft:matching_blocks",
            "blocks": "minecraft:grass_block"
          }
        }
      ]
    },
    "tries": 128,
    "xz_spread": 5,
    "y_spread": 1
  }
}```

I've tried different ways but I'm still getting errors on console when restarting

This is how it currently generates