Merge variables for color that can be used in styles and as swatches
Merge doc variables for colour.
An option on the colour swatch to add a reference to link to a merged variable from a csv for a hex, rgb or cmyk colour. This would allow specific swatches to update styles in a document for text color, lines, background colors etc if a document defined style uses that particular swatch.
Colin Flashman commented
There are workarounds that may assist: