How can I yaw the P1's gimbal to the same angle as the aircraft heading so that it is pointing straight ahead?

I have tried creating a DJIWaypointV2Action with a DJIGimbalRotation actuator and passing values for pitch and yaw. The pitch value works as expected and the camera points straight down (-90). However the yaw value does not do anything. Since the mode is set to DJIGimbalRotationModeAbsoluteAngle I would have expected the gimbal to have pointed in the direction of the aircraft heading (as per the docs) but it does nothing.

If this isn't the way to do it, is there a way to reset the yaw of the gimbal to 0 degrees relative to the body frame?

My bad, I misread the documentation - Angle rotation is relative to true North in WaypointV2MissionAction rather than aircraft heading.
I found it is easier to call the resetWithCompletion function of the DJIGimbal class to reset the gimbal axes prior to loading the mission.

Alternatively I guess I could have called rotateWithRotation:completion directly in the DJIGimbal class and then that rotation would have been relative to the aircraft heading

Did this work for you? Were you able to programmatically change the YAW for the gimbal on reaching a waypoint?