xml create xml google product rating

I would like to submit product reviews to Google Product Ratings, but Google accept only XML. Do you know how I can make this? I have Excel File Reviews generated from stamped.io. I just need a proper XML to be submitted to google merchant.

Like this>>>>
https://developers.google.com/product-review-feeds/sample/
https://developers.google.com/product-review-feeds/schema

I would like you to create a Excel file that I can easily update and save as XML file that compatible with Google Platform