New enchantment 1.21 that makes end mobs recieve more damage

Im trying to make a datapack that adds an enchantment that works like smite but with end mobs, how can I make my enchantment only work on an specific type of mobs Here is all the code i got: { "description": "Ender Slayer", "supported_items": "#minecraft:swords", "slots": ["mainhand"], "weight": 1, "anvil_cost": 0, "min_cost": { "base": 1, "per_level_above_first": 0 }, "max_cost": { "base": 10, "per_level_above_first": 0 }, "max_level": 5, "effects": { "minecraft:damage": [{ "effect": { "type": "minecraft:add", "value": { "type": "linear", "base": 2, "per_level_above_first": 2 } } }]
} }