How to adjust UI LED brightness via CAN connection


I am using CUAV nano v5 (FlightController) and Here3 (GPS module).
Here3 has UI LEDs and Here3 supports CAN(recommended) and I2C.

When Here3 is connected to FC via I2C, the UI LED brightness can be adjusted with the parameter LED_RGB_MAXBRT.
However, I could not adjust brightness via CAN.

Is there any way to adjust the UI LED brightness via CAN?