Show the Meaning of Conditional Formatting on a Report

So I have a sheet and rows are color coded based on certain information. Check a box and the Row is purple. Check another box and the row is red, etc.

I have a report that shows that formatting perfectly. I would like to add a information to the report that tells the reader what the colors mean. In Excel I can add a textbox to a sheet. Any thoughts on how to show this?

BTW, the Report is a bit too big to display in a Dashboard with the legend in a text field.