The ability to annotate a visualization, for example a chart or graph, would make both the dashboard and reports experience more robust.
A built-in annotations feature integrated into the visualizations is what we need for our product. Sadly, there does not seem to be much traction with this idea since it was submitted in 2015. We'll likely build it as a custom feature using Power BI embedded capabilities. Domo - one of Microsoft's competitors in the Analytics/BI space - seems to offer this capability out of the box. https://knowledge.domo.com/Engage/Sharing_Content_in_Domo/Adding_Chart_Annotations
