how to add a block above the product grid

Hi lost.hinata,

Thanks for reaching to us.

Please edit the Category in which you want to add the description and add the description: https://ibb.co/DgZSj7d

You can use any HTML block in the category description as well. You need to create HTML block for each category https://xtemos.com/docs/woodmart/html-blocks-2/ and use the shortcode in the category description: https://ibb.co/9czNS21

Also, you can set the Category description position from Theme Settings >> Product Archive >> Category description position: https://ibb.co/p1cpLK2

Kind Regards,