Hello,
1. Firstly, create an HTML Block in Dashboard -> HTML Blocks with WPBakery and add any content you need. Copy this block’s shortcode.
2. Follow this article and put the code for adding new tab to the functions.php
file in your child theme https://docs.woocommerce.com/document/editing-product-data-tabs/#section-5
3. Instead of these lines
echo '<h2>New Product Tab</h2>';
echo '<p>Here\'s your new product tab.</p>';
put your block’s shortcode like this
echo do_shortcode('[block id=""]');
Regards