Tootltip for specific measure column in Table visualization

akkibuddy7 

Go to the "Report" view.
Click on the "+" icon to add a new page.
In the "Visualizations" pane, click on the "Format" icon (paint roller).
Under "Page Information," toggle "Tooltip" to "On."
Design this page with the visuals and information you want to show in the tooltip.
Configure the Tooltip for the Measure:

Go back to your main report page.
Select the table visualization.
In the "Visualizations" pane, click on the "Format" icon (paint roller).
Expand the "Tooltip" section.
Set the "Type" to "Report page."
Select the tooltip page you created from the "Page" dropdown.
Add the Measure to the Tooltip:

Ensure that the measure Measure = COUNTROWS(Table_Name) is included in the tooltip page.
You can add additional context or visuals related to this measure on the tooltip page.