Show a master feature roadmap bar with different colors based on workspace

I currently have master features across different workspaces but they can roll up to the same master feature or initiative. I would like to be able to show a bar broken up by color based on the number of features for each workspace. Example bar 1 that resides in Q1 for initiative 1 but has features in workspace x and y. Workspace x has 10 features for initiative 1 and 10 features in workspace y for initiative 1. I'd like to have the bar to be viewed as 50% 1 color for workspace x and 50% another color for workspace y. This could be for up to 3 workspaces for each master feature or initiative.