Missing MQTT topic for IR led brightness

I have a IN-9408 2K+ camera. I want to control the IR led through MQTT. I can switch it on/off using the features/nightvision/autoled topic, but I don’t find any topic that would correspond to brightness. Is there any way to make it work?

This is a new CGI command that was added with the latest firmware update:

It will be added to the MQTT API with a following update. But can already be set using the HTTP API:

param.cgi?cmd=getlightstrength