It would be helpful if POSTS GRID could combine (AND relation) taxonomies.
Example: If I have the Woocommerce taxonomies “color” and “size”, I could show all red products and all xl-size products together, but I can’t combine it, so it shows only RED+XL-SIZE products.
Unfortunately, the WordPress attributes do not work for me in the selection. I can neither type in “Adidas” from your demo data nor enter the term ID in the shortcode.
If these are not yet supported, then they would also be important as a feature request.