BME680 air quality sensor Humidity offset

Hi,
I have installed the BME680 on the RPI3 B+ but I have an issue with the humidity sensor.
As it is near to the board I have a value that is really lower than reality.
As reference, I have a KNX AQR that reports 45% where the BME680 23%,
is there a way to adapt this in order to have a more realistic calculation of the AQI ?

As info the I had to set the ‘temp_offset: -9.4’ for temperature sensor.

Thanks