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@louisgcom This functionality already exists.
You can display the Structured Data on any single page in your website. In the wp_options table, change the option with option_name: google_business_reviews_rating_structured_data to the Post ID of the page.
According to the Schema documentation, they recommend only including this once per website. So, find a good location and set this as the page. I’ve covered this in more detail in an old forum post.
If you just want the Structured Data, there is a Shortcode for this, which can also run within do_shortcode():
[reviews_rating structured_data]