fz-survival-datapack/data/fz/advancements/event/on_piglin_trade.json

{
    "criteria": {
        "on_piglin_trade": {
            "trigger": "minecraft:thrown_item_picked_up_by_entity",
            "conditions": {
                "entity": {
                    "type": "minecraft:piglin"
                }
            }
        }
    },
    "rewards": {
        "function": "fz:event/on_piglin_trade"
    }
}