See what columns or measurements are active / used in visuals and other columns/measurements

I would love to be able to see, in the Fields pane, if a column or measurement is being used or not.
Reports are "alive" and new columns/measurements are being added or removed. Sometimes formulas are changed and the old stuff is not removed. This results in the FieldsPane getting bigger and bigger.

If it's possible to see what columns/measurements are being used in a visual or in other columns/measurements, it's easier to clean up a report and keep it workable.

It will also be easier to work in someone elses report. To check and see what of all the data is being used, how and where.