Dictionary for colors of data series

The colors applied to data series is based on current template. However, it's frequent to have specific colors for categories / products / regions. A useful tool would be the ability to generate a "dictionary" of colors associated to terms/names found in data series. Importing the dictionary in a report could automatically apply these colors to new visuals. For example, if I define Contoso = #ff0000, Litware = #00ff00, I expect these colors to be used whenever the data series is related to a name like Contoso or Litware, keeping the template defined color in any other case.