qmk_firmware/layouts/default/ortho_2x3/info.json

{
    "keyboard_name": "2x3 ortholinear layout",
    "url": "",
    "maintainer": "qmk",
    "width": 3,
    "height": 2,
    "layouts": {
        "LAYOUT_ortho_2x3": {
            "layout": [
                {"x":0, "y":0},
                {"x":1, "y":0},
                {"x":2, "y":0},

                {"x":0, "y":1},
                {"x":1, "y":1},
                {"x":2, "y":1}
            ]
        }
    }
}