∑ Time Spent how to use to get the sum of total time spent

[Anirudh Ammuru]

Hi , 

I am using a below filter 

InPut :

Project = "ABC" and Issue type(Story,sub task) and issueFunction in aggregateExpression("Total timespent for all Issues " , "timespent.sum()") 

Output:

Total timespent for all Issues : 27 Weeks 5 hrs

How to use the above filter for instead of Time spent need to use for this field ∑ Time Spent  

issueFunction in aggregateExpression("Total timespent for all Issues " , "∑timespent.sum()")  is not working