qmk-firmware/keyboards/xiudi/xd004/info.json

{
    "keyboard_name": "XD004", 
    "maintainer": "qmk", 
    "layouts": {
        "LAYOUT_all": {
            "layout": [{"label":"L", "x":0, "y":0}, {"label":"O", "x":1, "y":0}, {"label":"V", "x":2, "y":0}, {"label":"E", "x":3, "y":0}]
        }
    }
}