qmk_firmware/keyboards/handwired/splittest/teensy_2/info.json

{
    "matrix_pins": {
        "cols": ["F7"],
        "rows": ["F5"]
    },
    "diode_direction": "COL2ROW",
    "split": {
        "soft_serial_pin": "D1"
    },
    "processor": "atmega32u4",
    "bootloader": "halfkay"
}