Hover Yaw PID values Q_A_RATE_YAW being used in the code

I have the Vtol freeman 2100 with a pixhawk orange cube. I’m trying to understand the core code on github better, we have Q_TILT_TYPE = 2 enabled for the yaw in hover to be stabilized by the tilt servo angles.

Can someone direct me to the massive chunk of code where the parameter value Q_A_RAT_YAW_P is used?