Hello,
You can add the text to the category. You can add the text in the Category Description and paste it at the bottom. This option is provided in the Theme Settings > Shop > set the Category description position.
You can also insert the text in the product page by means of the extra content block. https://xtemos.com/docs/woodmart/product-page-options/#local_settings Extra content position: After content, Before Content, Prefooter
You can insert different text for different products or insert HTML block code with one and the same content https://xtemos.com/docs/woodmart/html-blocks-2/
Best Regards