Second GPS, PX4 and QGC

Hello,

I have external GPS module which could provide the NMEA messages. It also gives HDT with heading (yaw) by dual antenna functionality. Beside the primary GPS (https://docs.px4.io/v1.9.0/en/gps_compass/) I want to feed the NMEA messages into the CubeBlack running PX4 (or Arducopter) firmware with QGC for replacing/lowering the yaw angle weight of compass because of strong magnetic field environment in my application.

Does anyone have experience on this? Thanks in advance.