Reference cells in excel template , or using a select inside a start

[Power_Manage]

Hello
So I have a workflow rule , generating an excel template.
In that template , I have a start expression which brings filtered table , and a few of its columns.
Now I am trying to run a sum select using this columns .
So how can I reference the select to this columns ?
is it possible through the excel cell or another method ?
I dont want to create a VC for this , so it wont slow down the app load.
Is it possible in any way without a VC column ?