bedrock-samples/behavior_pack/loot_tables/gameplay/fishing.json

{
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "loot_table",
          "name": "loot_tables/gameplay/fishing/junk.json",
          "weight": 10,
          "quality": -2
        },
        {
          "type": "loot_table",
          "name": "loot_tables/gameplay/fishing/treasure.json",
          "weight": 5,
          "quality": 2
        },
        {
          "type": "loot_table",
          "name": "loot_tables/gameplay/fishing/fish.json",
          "weight": 85,
          "quality": -1
        }
      ]
    }
  ]
}