Is it possible to show calculated value if multible objects are selected?

Hi there

Is it possible to replace the value (changeable) in the client that shows up if you select more then one object with a calculated value of all selected objects?

Example:

We have a number of hours in a property:

If I select more objects, it would be cool, if that value is sum up together of all selcted objects and show that instead. 

Is there a way to achive that?

Alternative I only see to make a new property with a calculated proeprty from the compliance kit, right?

Thanks in advance!

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