How to convert CSV to XML coming via REST Adapter attachment?

Summary

REST Adapter CSV attachment conversion to XML for final HDL file.

Content

I am looking for solution around converting CSV attachment that's coming in via REST Adapter to be converted to XML so i can finally convert it to HDL too at a later stage. As of now, I am storing the CSV as Opaque element using STAGE and then reading it as CSV and returning a JSON response when REST API is called. Any guidance on this will be highly appreciated.

Added an image of the flow currently.