Confused: my fan has a "moisture"-feature, how does it work?

[tbratfisch]

My fan has a moisture-feature, it can evaporate water using ultrasound and inject it into the fan, but I can't get how that is working in the tuya API.

My device shows up like this:
"functions": [
{
"code": "switch",
"type": "Boolean",
"values": "{}"
},
{
"code": "mode",
"type": "Enum",
"values": "{"range":["nature","sleep","fresh","smart","strong","closed"]}"
},
{
"code": "fan_speed",
"type": "Enum",
"values": "{"range":["1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26"]}"
},
{
"code": "switch_horizontal",
"type": "Boolean",
"values": "{}"
},
{
"code": "countdown",
"type": "Enum",
"values": "{"range":["0","1","2","3","4","5","6"]}"
},
{
"code": "anion",
"type": "Boolean",
"values": "{}"
}
],

It's the same using tuya's API explorer, so the moisture-feature doesn't seem to appear in the device-features reported by the tuya API.
But: the tuya app is able to control it, if I change the setting in the app (in that case changing the moisture-level to 2), this project is reporting the changes:

021-07-17 20:12:53 DEBUG (Thread-7) [tuya iot] _on_log: Received PUBLISH (d0, q0, r0, m0), 'cloud/token/in/6dfd3613ff08bff67408a068b9733d28', ... (284 bytes)
2021-07-17 20:12:53 DEBUG (Thread-7) [tuya iot] payload-> b'{"data":"842ljSA53/3TyWCIUleXs33/yCCxA+72h/AaEYJaBJad7xvSIs0PLdKGeTU32HgNBj2LhiiEhc6NtC3rR1vSmvQ4j0E2MBMFOjzTXj4PBawvnx7f+uFiT67eTOVgYRa7qKKT9RJ0qXOY6hjjUZDP1aVk2W3aVNLRElps2f9eopBj+wW7Bfn8H/H1GSm0FDUe","protocol":4,"pv":"2.0","sign":"5925a67b1ab5c2c53622d7b7f39ca3a3","t":1626545572}'
2021-07-17 20:12:53 DEBUG (Thread-7) [tuya iot] on_message: {'data': {'dataId': '16fcddde-bc73-4bd2-8ead-31855279608b', 'devId': '27478210fcf5c48154c3', 'productKey': '2r65vzsm3j3dv5bc', 'status': [{'101': '2'}]}, 'protocol': 4, 'pv': '2.0', 'sign': '5925a67b1ab5c2c53622d7b7f39ca3a3', 't': 1626545572}
2021-07-17 20:12:53 DEBUG (Thread-7) [tuya iot] mq receive-> {'data': {'dataId': '16fcddde-bc73-4bd2-8ead-31855279608b', 'devId': '27478210fcf5c48154c3', 'productKey': '2r65vzsm3j3dv5bc', 'status': [{'101': '2'}]}, 'protocol': 4, 'pv': '2.0', 'sign': '5925a67b1ab5c2c53622d7b7f39ca3a3', 't': 1626545572}
2021-07-17 20:12:53 DEBUG (Thread-7) [tuya iot] mq _on_device_report-> [{'101': '2'}]

Can someone explain to me how the app queries the existence and/or possible values of this feature?
Thanks in advance!