How do I update an ASIN’s pre-order date?

I’ve checked the Product Details page but only see the Product Site Launch Date.

Does this need to be done via a partial update using a product template? If so, can someone let me know how to download the template for an existing ASIN? I know the variation wizard works if the ASIN is part of a family, but not sure how to do it for ASINs without a family.

I’ve tried using a blank template with the fields I can see for the ASIN on Seller Central populated, but get quite a few errors for unpopulated template fields I can’t locate on the Product Details page. I rather avoid guessing for the unpopulated fields as I think that would cause the fields to change as well if I input the incorrect values compared to what already exists for the ASIN.

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