Ability to Export Engagement History, more analytics for reporting exports

I am trying to pull contact open rates out of CC so I can enter them as a formula in rating donor prospects with other data that is not just segmenting them on Open Rates. A chat support person said there is not a way to generate a list/report that includes a column with the Avg Open Rate. That seems like it would be basic since it is a field for viewing in the engagement section of contact info. Is it truly not possible and if not, why?