How can I configure parameters in VTOL mode to enable the forward thrust vectoring by involving the servo at the front of the aircraft to adjust attitude?

In the tilt-rotor VTOL mode, how can parameters be set to enable the forward tilt servo to assist in adjusting roll and pitch, thus achieving thrust vectoring?
In the APM firmware, there’s a parameter called Q_TILT_FIX_ANGLE. This is the angle the motors tilt down when at maximum output for forward flight. Set this to a non-zero value to enable vectoring for roll/pitch in forward flight on tilt-vectored aircra. I’d like to achieve the same functionality in PX4 firmware. How can I set this parameter?