Shopify Schema Markup for Testimonials Widget may be pretty complicated (since it will depend on the review apps that you're using), I recommend you leave it for the experts.  Please come to feel free to Get in touch with me for virtually any support in set up, configuration, and customization https://sociallytraffic.com/story4415107/a-review-of-prestashop-scrolling-info-based-on-selected-category-and-language