Writing stage file as arrays containing another array as appending/loop

Summary

want to write a stage file as array which contains another array through a loop

Content

Hi All,

I have a requirement to save a following structure as an XML and then read it.

I have set of products and for each product there is  a set of attributes.

For this i get the list of products, and then by looping through the products using FOR-EACH, i am getting the attributes using another REST API call.

 

For this i tried to write the each loop outcome of product to a stage file along with the attribute with APPEND file option as an XML. And outside the loop i tried to read the same.