Update Squarespace Product using Google Form

To update a product in Squarespace, I would like to use a google form to allow external users to update Product Description and replace an image.

I am testing this for a client using my Squarespace and Google accounts.

I have connected the google form and Squarespace. I would like to use the Product SKU as the unique identifier. I need help to map this. I did test it using the Product ID and was able to update the Description but I need the unique identifier to be the SKU. Would also like to include hyperlinks to external URLs within the description. Then for replacing the image, I do not know how to do that. Any help would be appreciated.