qmk_firmware/keyboards/ploopyco/trackball_thumb/rev1_001/keyboard.json

{
    "usb": {
        "device_version": "1.0.0"
    },
    "diode_direction": "COL2ROW",
    "matrix_pins": {
        "direct": [
            ["D5", "B6", "D4", "D2", "E6", "D7"]
        ]
    },
    "rgblight": {
        "led_count": 3,
        "max_brightness": 40,
        "animations": {
            "breathing": true,
            "rainbow_mood": true,
            "rainbow_swirl": true
        }
    },
    "ws2812": {
        "pin": "B5"
    }
}