Hello,
Yes, we used the single product builder there. If you don’t want to use the single product builder you can use WooCommerce Hooks to display the necessary custom information or in your case, I would suggest creating custom widget area (you’ll be able to place a Static block with the necessary content there) https://qodeinteractive.com/magazine/add-widget-area-to-wordpress/ and show that custom widget area in that place using WooCommerce Hooks https://www.businessbloomer.com/woocommerce-visual-hook-guide-single-product-page/
Regards
