Hi there,
if you want it displayed below the posts, then create a new Block Element, design the layout like you did for the hero.
To display the description, add a GP Dynamic Content Block, and from its options select Term Description.
NOTE: The GP Dynamic Block doesn’t have style controls, but it will inherit any typography / color settings you add to the Container Block it sits inside of.
The Hook to display below post is the after_main_content
https://docs.generatepress.com/article/hooks-visual-guide/