How to execute a function as the hurt entity

{
    "criteria": {
        "hit_with_guardian_scythe": {
            "trigger": "minecraft:player_hurt_entity",
            "conditions": {
                "player": {
                    "equipment": {
                        "mainhand": {
                            "items": "minecraft:netherite_axe"
                        }
                    }
                },
                "entity": {}
            }
        }
    },
    "requirements": [
        [
            "hit_with_guardian_scythe"
        ]
    ],
    "rewards": {
        "function": "jestem.cool_weapons:guardian_scythe/on_hit"
    }
}