How to add script in header of product pages only.

Google is showing me these 2 errors in the Search Console:

Missing field “hasMerchantReturnPolicy” (in “offers”)
Missing field “shippingDetails” (in “offers”)

I generated the schema code for those two parameters, but I need a way to insert it into the header in my product pages only. I considered adding a dedicated schema plugin, but it looked much too complicated for me. Can your plugin do what I need?


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