Add an additional field to category pages

It would be really great if an additional text field could be added to product categories so I can split the content between the top of the page and under the products.
This would mean you could add a paragraph about that category above the products and then have more relevant content underneath for SEO purposes.

I realise this can be done with ACF and Divi Engine but it would be great to minimise the plugins required to achieve something like this and most ecommerce websites I come across have something similar.