Hello
Please check
www.balbooa.com/knowledgebase/32-documen...-positions-in-joomla
There you will see how you may check module positions for any Jooma page.
After enable option "Show position" - you, on any our page, may add to url parameter tp=1 - and you will see all "Modules positions".
So next: in Joomla Module manager you may use them for some your module, as example for "Custom HTML", and in this module add your text.
If you have many categories, and you need self description to every category,
We may propose to you order this as "customization service".
Please write to OrdaSoft contact form (
ordasoft.com/contact-us-form) with full details description, how all must look and work, and we will give to you quota.
Best Regards,
OrdaSoft team