I hope you are well today and thank you for your question.
You can achieve this by enabling Unyson SEO extension and then add appropriate text in the SEO Description field of category by editing it as shown in the attached screenshots.
I do not mean the SEO description. I would like to add text to the category as this plugin does: https://es.wordpress.org/plugins/enhanced-category-pages/
But with your template it does not work.