Heading hold and Servo Control in Android based application. Qgroundcontrol is not supporting right now

I am using herelink and want to plan spray mission with heading hold and servo ON. Please help regarding this issue.

Is it possible to turn ON heading hold option in the Grid setting.
I want to plan mission for spray operation. If you (researchers) have any idea regarding the auto WP mission with servo control and head hold path planning using Android application.