Color schemes cannot be applied to Calculated Values in Text Areas today. There should be an option to apply a color scheme to Calculated Values. This allows color schemes used elsewhere in the dxp be reused. Without this capability, users have to duplicate effort to define color rules for Calculated Values.
Example (see attached images):
The "Bed Utilization" Calculated Value in TS-I-6187_(a).png should be able to reuse the color scheme defined in the bar chart in TS-I-6187_(b).png.