Hello, we apologize for the inconvenience you’re experiencing with optimizing the SEO for your category pages. To customize the meta descriptions for your product category archive pages, you can use dynamic variables to include product names/titles in the search results.
When creating a template for the category descriptions, you can use dynamic variables to include product names/titles. These dynamic variables will automatically populate with the relevant product information when the page is displayed in search results.
To see all the variables available, click the drop-down button on the top right of the text field. A drop-down menu will appear, containing all the variables. You can scroll to see all the variables or filter them by typing any characters on your keyboard.
Here’s an example of how to use dynamic variables to include product names/titles in your category descriptions:

By using these dynamic variables, you can ensure that your product names/titles appear in the search results, optimizing the SEO for your category pages.
If you have any further questions or need additional assistance, please feel free to ask.
Sources:
Rank Math ‘Titles and Meta’ Options and Settings
Hello,
Thank you for contacting Rank Math support.
In this case, you can programmatically change the SEO Title and Description for the category pages. For example, to change the SEO Title of the category page, you can use this filter. You can find our full list of filters here.
You can use any of the methods listed here to add the filter code to your website.
Thank you for choosing Rank Math!
Hello,
We are glad to know that this issue has been resolved. Thank you for letting us know.
This ticket will be closed now, but you can always open a new one if you have any other questions or concerns. We are here to help you with anything related to Rank Math.
We appreciate your patience and cooperation throughout this process.
Thank you for choosing Rank Math.