auto pitch down in survey mode

Hi
I would need advice. I have a Grimbal Gremsy who works in serial data with Cube Orange and Herelink.
I can't automate the pitch in perpendicular mode at the beginning of a survey mission. Is it possible that Missionplanner does not have a flag to enable the cam orientation at the beginning of a mission and in the end?
It is quite frustrating to manually write DO_GIMBAL_MANAGER_PITCHYAW= -90 (or DO_MOUNT_CONTROL) at the beginning and end of a mission (at least ... I think the instruction is correct)... Is there another way maybe with Gremsy?
Do you have advice?   Thank you

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