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please give some more details. Do you get the instance from an selection? Which cell do you want to sum up the transformations to? Could you please paste some code that illustrates your problem?
This question is also of interest to me.
If I have selected a shape, how can I get the absolute transformation in a Python script? In other words, inside a script, how can I get the value that is displayed in the user interface window "Object properties" when the box "Absolute (accumulated) transformation" is selected?