qmk_firmware/data/constants/keycodes/keycodes_0.0.2.hjson

{
    "ranges": {
        "0x8000/0X3FFF": {
            "define": "QK_UNICODEMAP"
        },
        "0xC000/0X3FFF": {
            "define": "QK_UNICODEMAP_PAIR"
        }
    }
}