Visualization Gallery view(s) - Difference between Dashboards versus Reporting.

[FerdH4]

Has anyone uncovered a view (or even an extra pane requiring extra navigation to access) of Dashboards' Visualization gallery that is similar to the Visualization gallery view within Reporting? 

Specifically, I'm interested in an (on-screen) reference to the number of data items each Visualization can accommodate and the key intent of each Visualization.  For example, in Reporting's Visualization gallery, there is a key indicator on the screen showing that Pie charts can only accommodate one category and one values data item; and, with Line chart, for example, there is helpful text next to the chart thumbnail which indicates that "You can use line visualizations to show trends over time..."