Chart is highly customizable, read how to set up your own style for each chart.
While creating a chart, click Settings at the bottom right corner to see what could be customized. The common setting for all charts is Color. You could type HEX codes one by one or use array of colors.
The easiest way to import colors is to select layers, copy their CSS with the context menu, paste the result right in color input and press enter.
Chart has enough default setting to produce beautiful charts.
Note: Chart couldn't be created without at least one color in Settings.