eCognition segmentation: How to calculate relative area in super-object and relative position to super-object?

In eCognition, I’m attempting to assess my segmentation results against a set of reference image objects that I have manually digitized.

After performing an overlay function between the segmented image objects and the reference image objects, I would like to calculate the metrics relative area in super-object and relative position to super-object.

I have read in published papers that these metrics can be implemented in eCognition, but I can’t work out how to calculate these metrics using eCognition.

Is there a particular tool or algorithm I need to use?

Many thanks,

Sarah