qmk_firmware_custom/keyboards/hifumi/info.json

{
  "keyboard_name": "hifumi",
  "url": "https://github.com/zk-phi/1x2x3-keyboard",
  "maintainer": "riconken",
  "width": 3,
  "height": 2,
  "layouts": {
    "LAYOUT": {
        "layout": [{"label":"F5", "x":0, "y":0}, {"label":"Up", "x":1, "y":0}, {"label":"PrSc", "x":2, "y":0}, {"label":"Left", "x":0, "y":1}, {"label":"Down", "x":1, "y":1}, {"label":"Right", "x":2, "y":1}]
    }
  }
}