Product Line Goals Effort derivation from underlying Product Goals

The default chart shows the Effort/Investment for Product Line Goals. This is updated manually. But if there are multiple Product Goals that roll-up to the overarching Product Line Goal, it would help if the overall effort for the Product Line goal is derived rather than having to manually set it on the chart. For example, if the Product Line has underlying 9 different Product Goals, the effort for those 9 different Product Goals should roll-up to the Product Line Goal.