Can alerts for Performance documents be customized to send a consolidated list to each manager?

Summary: Can alerts for performance documents due be consolidated to one alert for each manager?

Content (please ensure you mask any confidential information):

We would like to use Alerts Composer to create a custom notification that sends one notification to each manager with a list of the employees that are due, however there is not a resource available for performance. Can the standard and critical alert notifications be customized to accomplish this?

Version (include the version you are using, if applicable):

23C or 23D

Code Snippet (add any code snippets that support your topic, if applicable):