Hello,
I apologize for the issue you are facing. Currently, the context does not provide specific instructions on automating the insertion of review ratings for the Product Schema in Rank Math. However, you can refer to the following resources that might help you understand how to add review ratings:
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Using Review Schema Type to Earn Star Ratings: This article explains how to add Review Schema markup to your pages, which is essential for earning star ratings in SERPs. You can find it here.

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Earning Star Ratings in SERPs by Using Schema Markup: This article discusses various types of schema, including Product Schema, and how to implement them effectively. You can read it here.

If you have further questions or need more specific guidance, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further. Thank you for raising this concern!
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.