bedrock-samples/behavior_pack/trading/fisherman_trades.json

{
  "tiers": [
    {
      "trades": [
        {
          "wants": [
            {
              "item": "minecraft:fish",
              "quantity": 6
            },
            {
              "item": "minecraft:emerald",
              "quantity": 1
            }
          ],
          "gives": [
            {
              "item": "minecraft:cooked_fish",
              "quantity": 6
            }
          ]
        },
        {
          "wants": [
            {
              "item": "minecraft:string",
                "quantity": {
                  "min": 15,
                  "max": 20
                }
            }
          ],
          "gives": [
            {
              "item": "minecraft:emerald",
              "quantity": 1
            }
          ]
        },
        {
          "wants": [
            {
              "item": "minecraft:coal:0",
              "quantity": {
                "min": 16,
                "max": 24
              }
            }
          ],
          "gives": [
            {
              "item": "minecraft:emerald",
              "quantity": 1
            }
          ]
        }
      ]
    },
    {
      "trades": [
        {
          "wants": [
            {
              "item": "minecraft:emerald",
              "quantity": {
                "min": 7,
                "max": 8
              }
            }
          ],
          "gives": [
            {
              "item": "minecraft:fishing_rod",
              "quantity": 1,
              "functions": [
                {
                  "function": "enchant_with_levels",
                  "treasure": false,
                  "levels": {
                    "min": 5,
                    "max": 19
                  }
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}