Start with array size 0,3,1
+ System: On start of layout
+ System: Repeat Sprite.Count times
-> Array: Push back 0 on X axis
-> Array: Set value at (LoopIndex, 1) to Sprite(LoopIndex).X
-> Array: Set value at (LoopIndex, 2) to Sprite(LoopIndex).Y
This will only work if they are all instances of the same object.
If you need to do so for multiple sprite objects, put them all in a family and replace "Sprite" with the family.