qmk_firmware/modules/qmk/hello_world/qmk_module.json

{
    "module_name": "Hello World",
    "maintainer": "QMK Maintainers",
    "features": {
        "deferred_exec": true
    },
    "keycodes": [
        {
            "key": "COMMUNITY_MODULE_HELLO",
            "aliases": ["CM_HELO"]
        }
    ]
}