AFAIK, there isn't anything in the charts that lets you get the column colors. The best you can do is assign colors to the chart series manually and extrapolate based on that. Ex: if you set your colors option to "colors: ['red', 'green', 'blue']" then column 0 is always red, regardless of how many columns you have in total. If you assign more colors than columns, the extras are ignored.
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