How do I configure email notifications to be sent to another user when a report package is operated?

We are using a report package of Narrative Report.

Our maintenance team copy a report package that is template, and rename copied report package to YYYY-Mon(ex. 2025-Jun).
Then, They execute "Data source refresh" on copied report package.
After executing "Data source refresh", Narrative Report sends a mail of summery.

We want to receive the mail at other user(ex. Our Boss) of Narrative Report.

I think other user has to be registered as an assginer of report package to receive the summery mail, Am I right?

I searched documents but couldn't find the detail.