Dynamic Sum based on Multi-Select in Context Selectors

This is an extension of already requested options to select multiple items in a UX context selector (for reference, see that Idea here and here).   I wanted to call out the specific request that it be possible to have dynamic sum based user-selected context items.  The point has been mentioned in these Ideas here above but not as the primary requirement, so I create that here.  The point has come up in multiple forums: not just to have multi-select context selectors, but to see the resulting sum.

There are potentially ways to provide this indirectly through the use of a filtering module but this needs to be considered carefully, and multiple companies have requested the possibility to have this as native functionality in the platform.