As a user, I'd like to be able to set the colors in the "Default" section of the Chart configuration screen to align with my company's style guide. This way, when I create a chart I don't need to manually update the colors every time - they will automatically be in our company's standard.
Thank you for the idea. As noted, it is currently possible to edit the colors on charts. At this time we do not have plans to add a default option, but we will continue to monitor customer feedback here.