In a publication, users can only add the Current Date from the Dynamic Text dropdown.

But if another time period is needed and it's available in the model, here is how to show it in your publication.

1. Create discovery and add the period attribute to both Filter and Rows drop zones.
   Once the attribute is placed, make sure that the slicer setting for the "Initial selection mechanism" is set to either "first" or "last" (depending on where the current period is located).

   

   

2. Create a "Dynamic text" element in the publication that will point to the specific Period cell in the discovery.
    

   

   

3. Every time you will publish the publication, the "Dynamic text" will automatically update to show the required time period.