qmk_firmware/modules/qmk/super_alt_tab/qmk_module.json

{
    "module_name": "Super Alt Tab",
    "maintainer": "QMK Maintainers",
    "license": "GPL-2.0-or-later",
    "keycodes": [
        {
            "key": "COMMUNITY_MODULE_SUPER_ALT_TAB",
            "aliases": ["CM_S_AT"]
        }
    ]
}