Hello,
In principle it could be done if you edit the php file with the product sheet template and add the link.
If you are using the Boutique store pack and you have not changed the template in use, you would have to edit the templates/gk_boutique/html/com_virtuemart/productdetails/default.php file. Previous backup you would have to add the following code:
For example, it could be placed on line 271, just below the following code:
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