minecraft-assets/data/minecraft/worldgen/placed_feature/potato_tree.json

{
  "feature": "minecraft:potato_tree",
  "placement": [
    {
      "type": "minecraft:count_on_every_layer",
      "count": 6,
      "start_offset": 0
    },
    {
      "type": "minecraft:biome"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:would_survive",
        "state": {
          "Name": "minecraft:potato_sprouts"
        }
      }
    }
  ]
}