Hello,
You can add description one by one to the products and you also used the same content.
But there is no such option to write some description in a block and then select products for that description. This is not possible currently.
You can try the “Additional tab” option from Theme Settings > Product page > Additional tab title/content https://prnt.sc/p4ovpn
But remember that it shows only when you set showing an attribute on the product page, WooCommerce generates and additional information tab and shows the attribute.
Best Regards.