Adding a Short Description to the "Catalog" Page

I have added a description to the “Catalog” or “Shop” page using:

add_action( 'woocommerce_after_shop_loop_item_title', 'woocommerce_template_single_excerpt', 9 );

I want only part of that description to show up on the Shop page, and then have a “Read More” button that takes you to the single product page. The problem is that I don’t know to only show part of the description. Ideally I would be able to use the “Insert More Tag” from the visual editor. Any ideas?

https://www.ads-software.com/extend/plugins/woocommerce/