How do you include a product's aggregate rating in the structured data?

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I've been searching the forums and haven't found a way to publish the product's aggregate rating value. We use TrustPilot for our reviews and have reviews for some of our products, but when I run the Google Structured Data Testing Tool on our product pages, we get this warning:

The aggregateRating field is recommended. Please provide a value if available.


Any suggestions?