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?

You will probably have better luck asking this question in the PX4 forum.
ArduPilot and PX4 are entirely different types of Firmware.

I asked on the PX4 forum but haven’t received an answer yet.

Just out of curiosity: what’s the reason not to use ArduPilot?

Well, I managed to implement the feature using APM firmware. However, I’ve been learning PX4 firmware recently and I’d like to achieve the same functionality, so I came here to seek advice.