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
  }
}