Predicates in a bow enchantment's hit_block effect component

I am trying to make an enchantment for a bow which does some things through a function, which is triggered when an entity OR a block is hit. I've got the hitting an entity part working, but I am facing a problem with the hitting a block part.
The problem stems from the fact that the effect differs depending on the level of this enchantment. For hitting an entity, a predicate like this worked:
"requirements": {
    "condition": "minecraft:entity_properties",
    "entity": "attacker",
    "predicate": {
        "equipment": {
            "mainhand": {
                "items": "minecraft:bow",
                "predicates": {
                    "enchantments": [
                        {
                            "enchantments": "lqe:smoke",
                            "levels": 1
                        }
                    ]
                }
            }
        }
    }
}

This same approach won't exactly work for hitting a block, though. There is no attacker entity in the conext of the hit_block component. As far as I can tell, my only option for the entity is this but that would mean the predicate is checking whether the arrow projectile itself is holding a bow with the enchantment. Is there any way I can check if the player firing the arrow has the enchantment with the specified level?