Custom Macros for Email Templates In Creatio Studio

I need to create email templates that will autofill data from a "Potential Renters" table based on a match with the sender's email address as a primary key. Then I would like to select the corresponding values in the "Name", "Property", "Unit" columns.

Based on the documentation. I keep receiving an error that IMacrosInvokable can not be found. From another post, it seems like IMacrosInvokable is only available for macros in Creatio Service.

What is the work around for this?

Thank you!