Using Formulas to Reference a Grid in different Report in narrative reporting

Summary:

I created a book containing multiple reports. On the cover page/table of contents page, i would like to reference the period (eg. May 2024) for which the book is downloaded. The reference period exists in all of the reports but am not sure how to pull this onto the table of contents page.

The below formula only works for referencing grids in the same report. I would like to reference a grid that exists in a report outside of the table of contents.

REPORT BOOK AS AT: MemberAlias("Balance Sheet_Grid", "Period", H) MemberAlias("Balance Sheet_Grid", "Years", H)