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by "instances" I assume you mean the placement and orientation of the specific cell, right?
Internally, the transformation of the cell in the top cell is known. I can extend the display so it not only shows the cells but the placement and orientation as well. Is that what you are looking for?
The current version 0.21 already has a "detailed" check box in the net tracer dialog to show the cell instance details.
It's also worth mentioning the text export which allows to produce a text file containing the net items. The text file is actually XML and has a structure like that:
<trans>r0 *1 2572000,3640000</trans>
This file may be useful for other applications as well.