minecraft-assets/assets/minecraft/advancements/story/cure_zombie_villager.json

{
    "display": {
        "icon": {
            "item": "minecraft:golden_apple"
        },
        "title": "Zombie Doctor",
        "description": "Weaken and then cure a zombie villager",
        "frame": "goal"
    },
    "parent": "minecraft:story/enter_the_nether",
    "criteria": {
        "cured_zombie": {
            "trigger": "minecraft:cured_zombie_villager"
        }
    }
}