Show progress (based on story points) on the Releases / Portfolio and Releases / Details gantt charts

Why is it useful?

For each release, we create a phase for each sprint, and generally assign features to sprints - especially for features that have dependencies.
This helps us manage feature dependencies across products (and within products also).
It would be helpful to have a visual representation of how we are progressing (using story points) for a group of dependent features.

Who would benefit?

The PMs would have better visibility into how we're progressing on dependent features, and a better understanding of risks.
In other words, if Feature A is dependent on Feature B, if Feature B is not progressing, this will improve visibility into the fact that Feature A may be at risk.

How would it work?

I see this working similar to the way that we show progress on the home page - where a bar becomes darker, as the number of features is completed.
However, rather than basing the progress bar on the number of features, a percent of story points completed would be more helpful and more accurate.