Unable to Find 'Segment Cross-Section Area' Module in 3D Slicer 5.8.1 – Assistance Required

I would like to inquire about measuring the cross-sectional area of segments in 3D Slicer. I am currently using version 5.8.1. However, I was unable to locate the “Segment Cross-Section Area” module in the Extension Manager.

Could you please advise on how to proceed in this case?

The module is provided by the Sandbox extension. There are more advanced version of the module in VMTK extension.