Focus test Z travel to 100mm

Good afternoon (o;

Completed my retrofit of an Anycubic Mega X printer to a small LED laser engraver:

But as the Z-height is over 200mm for this machine I see that the focus test parameters are limited to 100mm maximum…

Is there a way to add a Z-offset to the focus test?
Even in layer settings I can’t set Z-offset lower than -100mm…

I tried with:

G0 Z-100
G92 Z0

Which works on the first run…the second time it wants to set Z Zero at Z-200.

thanks in advance

Ah it seems Grbl needs a G92.1 at first…:

G0 Z-100
G92 Z0

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