minecraft-assets/data/minecraft/loot_tables/blocks/twisting_vines_plant.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "conditions": [
            {
              "condition": "minecraft:random_chance",
              "chance": 0.33333334
            }
          ],
          "functions": [
            {
              "function": "minecraft:apply_bonus",
              "enchantment": "minecraft:fortune",
              "formula": "minecraft:uniform_bonus_count",
              "parameters": {
                "bonusMultiplier": 2
              }
            }
          ],
          "name": "minecraft:twisting_vines"
        }
      ]
    }
  ]
}