confOS/archinstall/user_disk_layout.json

{
    "/dev/nvme0n1": {
        "partitions": [
            {
                "boot": true,
                "encrypted": false,
                "filesystem": {
                    "format": "fat32"
                },
                "mountpoint": "/boot",
                "size": "512MiB",
                "start": "1MiB",
                "type": "primary",
                "wipe": true
            },
            {
                "encrypted": false,
                "filesystem": {
                    "format": "ext4"
                },
                "mountpoint": "/",
                "size": "100%",
                "start": "513MiB",
                "type": "primary",
                "wipe": true
            }
        ],
        "wipe": true
    }
}