Hello there,
Thank you for contacting Rank Math support. Apologies for any inconvenience this issue might have caused.
Rank Math adds the description property for the author if you’ve set the meta description for the author with Rank Math Snippet Editor on the author page.
To edit the snippet, navigate to WordPress Dashboard > Users and open the author profile you wanted to edit. Scroll down to find the Rank Math SEO box. Choose Edit Snippet.

Add in the Description field, and add the description for the author that you want to be added in the Author Schema Entity.

Click the Update User button at the end of the page to save the changes.
See this article for a detailed guide on the author schema entity: https://rankmath.com/kb/author-schema-entity/.
To include other schema properties, you may need to make use of our advanced schema builder to create a customized schema for your author which is only available for the PRO version.
Hope this helps and please don’t hesitate to let us know if you have any other issues.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.