Create sub-element to every element of the list

Hi All,

I am working with lists and require some guidance on the below scenario

I have list which contains 'n' elements. I would like to add a sub-element to each element in the list.

Assuming my list name called as "list{}"

Example: (My list currently looks like this)

    List{0}
        element1
        element2
        element3
    List{1}
        element1
        element2
        element3
    List{2}
        element1
        element2
        element3
    List{n}
        element1
        element2
        element3
        
I would like to add new sub-element called "element4" at the end of each list element (i.e., add "element4" as sub-element below "element3" )        

Expected Output (I would like to achieve something like below)

    List{0}
        element1
        element2
        element3
        element4
    List{1}
        element1
        element2
        element3
        element4
    List{2}
        element1
        element2
        element3
        element4
    List{n}
        element1
        element2
        element3
        element4

In Java world, I would ideally use looping to iterate through the list and add sub-element. Not sure how to perform similar scenario in FME. Would really appreciate your help in achieving the above expected output.

Thanks in advance