minecraft-assets/assets/minecraft/loot_tables/entities/iron_golem.json

{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:red_flower",
                    "weight": 1,
                    "functions": [
                        {
                            "function": "set_count",
                            "count": {
                                "min": 0,
                                "max": 2
                            }
                        }
                    ]
                }
            ]
        },
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:iron_ingot",
                    "weight": 1,
                    "functions": [
                        {
                            "function": "set_count",
                            "count": {
                                "min": 3,
                                "max": 5
                            }
                        }
                    ]
                }
            ]
        }
    ]
}