custom_mc_advancements/data/locations/advancements/hellmart.json

{
    "display": {
        "icon": {
            "item": "minecraft:campfire"
        },
        "title": "Welcome to Hell!",
        "description": "Visit Hellmart under the nether hub",
        "frame": "task",
        "show_toast": false,
        "announce_to_chat": true
    },    
    "parent": "locations:landmarks",
    "criteria": {
        "be_near": {
            "trigger": "minecraft:location",
            "conditions": {
                "dimension": "minecraft:the_nether",
                "position": {
			"x": {
			    "min": -70,
                            "max": 50
			},
                        "y": {
                            "min": 100,
                            "max": 125
                        },
                        "z": {
                            "min": -60,
                            "max": 50
                        }
                }
            }
        }
    }
}