Hello,
Thank you for contacting Rank Math support and we apologize for the inconvenience.
You can extend the current Organization schema for that purpose. Navigate to Rank Math > Schema Templates to create a custom schema, add your custom schema then switch to the Display Conditions and select Insert and then In WebSite Schema. You can learn more here: https://rankmath.com/kb/schema-templates/#extending-schema

We hope this helps. Thank you for your patience and cooperation
Will this only work in the premium version, as I can’t see schema templates in my dashboard.
https://prnt.sc/sc8kyXktrQCa
Hello,
I’m afraid that this feature is indeed for PRO users only. Also, if you purchase our plugin and activate PRO, you should be able to see the Schema Template option under WordPress Dashboard > Rank Math SEO > Schema Templates:
https://prnt.sc/1lP2YnKScvil
Hope that helps and please do not hesitate to let us know if you need my assistance with anything else.
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.