Hi Jen,
I am afraid there isn't anything like that avaialble out of the box. I assume that instead of displaying completed and remaining work based on story points you want to visualize the progress based on values of a custom field. If you are comfortable with javascript or can leverage intarnal resources you may write a custom AppSDK2 app that does that. Some time ago I wrote a sample app that calculated cycle time for a custom field. The code is avaialble here (
https://github.com/nmusaelian-rally/kanban-cycle-time). It does not build a chart, it builds a grid, but it calculates times based on historic data, and you may use this code as a reference. In any case, your app should be based on historic data returned by LookbackAPI (
https://rally1.rallydev.com/analytics/doc/#/manual), and AppSDK2 has a ShapshotStore (
https://help.rallydev.com/apps/2.0rc3/doc/#!/api/Rally.data.lookback.SnapshotStore) for that. Otherwise you may look into
Technical Services.