page information with optional icon (built in legend/help for each page)

My Power BI clients always need extra textual information regarding each and every sheet in the report.
currently I need to create an external excel file holding that information and create an artificial legend for each sheet in the report.
It would be great if this feature would be built-in the desktop (and service), in such a way that we would have a small question mark icon and when the end user click it , he would get the additional information that was added by the creator of the report.