In release 1.201204.0 we will be introducing in Chart(beta) the ability to modify chart element colors and create multiple themes that can be applied to charts. An overview of how to access this functionality is below:
Under the Chart Settings menu select Color Scheme:
You can make a copy of the existing color schemes as a starting point
Name your new color scheme
Change / modify the colors of the elements you would like to adjust
And Save your changes
Multiple color schemes can be created and applied to charts on a chart by chart basis and will change based on the overall Dark or Light theme selected for the Trader
Color Schemes will be saved with your Chart Template when the template is saved