The ability to annotate a visualization, for example a chart or graph, would make both the dashboard and reports experience more robust.
To me the product would become more valuable if users could annotate a dashboard and save for review by the team. This could be a case of annotate and save to PDF / email or better if a live copy of the dashboard and data as it was during the annotation is stored within power BI to be shared centrally with a version number and name.
