Ok, thanks for clarifying. I was able to test a branded affiliate link with the Product Link - it's still not showing the URL, title, or description for the ultimate landing page for the social preview, but it's a bit closer. Still really too bad that there's no way to customize the text (besides customizing the product name).
I do see that if I add an image to the Product Listing, that image will then appear in the social preview, so that's helpful!