Hi Matt. Unfortunately all Tuya devices are created differently so results can vary. I'm assuming your device Office light LEDs is an LED strip? If so, I think you might be able to use the control_device property then set the brightness using the JSON below (this will go in the value field when setting up the step):
Bright should be a value between 0 - 1000. And apparently change_mode can be either direct or gradient - I assume this affects whether the brightness changes immediate or gradually fades.
You can find more about there here in the Tuya API docs.
Let me know how you get on and if it doesn't work I'll see what else I can find.