Use override to modify laser power

I'm installing a 20w laser on my CNC and I control the power of laser using the spindle pwm. The software LightBurn use M67 to control the laser power. I modify the HAL file to connect  analog-out-00 to the spindle PWM and set the scale. The laser is ok and the power change. Can i use the slide of spindle override to increse and reduce  the new laser signal ????  I'm not expert to configure linuxcnc.