Review property on Structured data

Hi,

In Structure data testing tool for “Review” property I am experiencing this issue for all products on the website:
One of offers or review or aggregateRating should be provided.
https://search.google.com/structured-data/testing-tool/u/0/#url=https%3A%2F%2Fpowermetercity.com%2Fproduct%2Fassioma-duo-power-meter-pedals%2F

Is this something you can assist with? I would like to know a way how can I change JSON code for it.

Thanks

The page I need help with: [log in to see the link]