Adjusting margin sizes based on volume ratios and axes

[ally7113 (ally)]

Sorry for the low-quality image…

I would like to expand the existing segment in three directions based on the volume ratio.
For instance, I want to expand by 5% along the x-axis, 10% along the y-axis, and 10% along the z-axis. However, the margins are in millimeters, and I observed that the growth occurs uniformly in all three directions.

As I am not familiar with Slicer and Python, I would greatly appreciate it if you could provide detailed instructions on how to achieve this.

[muratmaga]

You can use PadImage filter in Simple filters which allows you to pad image in any value along 6 axis.

You can alternatively draw ROI and modify its extends under the ROI settings to match dimensions you want and then use the Crop Volume module.