FN-Key for Logitech MX Keys S - Which code?

[Dirk71]

Modification of the FN-key on my Logitech MX Keys S Keyboard doesn't work. I guess the code of the key is not "fn" but something different! Any ideas?

Here is an example for fn+s should activate the lock screen. fn has to be replaced by ....?

{ "title": "Lock screen and sleep by fn+s", "maintainers": [ "tekezo" ], "rules": [ { "description": "Lock screen and sleep by fn+s (rev 2)", "manipulators": [ { "type": "basic", "from": { "key_code": "s", "modifiers": { "mandatory": [ "fn" ] } }, "to": [ { "key_code": "q", "modifiers": [ "left_command", "left_control" ] }, { "software_function": { "iokit_power_management_sleep_system": { "delay_milliseconds": 1000 } } } ] } ] } ] }