zombie.json

{
    "pools": [
        {
            "rolls": 1,
            "items": [
                {
                    "item": "minecraft:rotten_flesh",
                    "weight": 1,
                    "functions": [
                        {
                            "function": "set_count",
                            "count": {
                                "min": 0,
                                "max": 2
                            }
                        },
                        {
                            "function": "looting_enchant",
                            "count": {
                                "min": 0,
                                "max": 1
                            }
                        }
                    ]
                }
            ]
        },
        {
            "conditions": [
                {
                    "condition": "killed_by_player"
                },
                {
                    "condition": "random_chance_with_looting",
                    "chance": 0.025,
                    "looting_multiplier": 0.01
                }
            ],
            "rolls": 1,
            "items": [
                {
                    "item": "minecraft:iron_ingot",
                    "weight": 1
                },
                {
                    "item": "minecraft:carrot",
                    "weight": 1
                },
                {
                    "item": "minecraft:potato",
                    "weight": 1
                }
            ]
        }
    ]
}