Constant color of a legend value

Constant color of a legend value

It would be nice if we can set a constant color/pattern to a value when creating a chart. We would often use the same value in different graph options and I always have to copy the color that we've set to a certain value from a previous graph to make it constant.  It would be nice if we can set that values color constant whenever we'll be using it.
Table: Sales table
Salesperson: James, John, Jessica
Bar graph: count of sales by salesperson (James - blue, Jessica - green, John - yellow). 
*if I create another bar graph by salesperson, I would like to have an option to use the same color set of each value instead of going back to the previous graph and checking what I used.

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