The best option looked to be to embed a hover action on an shape/image, but it doesn't look like you can access filter status or an edited caption to display in a tooltip. The default caption can get unruly and hard to read in a more complicated dashboard.
The other would be to use a title, but this would be always present, and the filter list could get lengthy depending on the dashboard.
Has anyone else found a way to display a succinct summary of filters?
A quick prototype is attached for the concepts above.