Thanks for your posting. There’s no direct report for this currently but you can simply use the XML/CSV exports and then generate your own custom reports based on this. The exports are available for runs/plans and milestones and include all results over time (including timestamp etc.) so it’s possible to generate the report you are looking for with a simple script that goes through the exports. The CSV file is likely the simpler format of the two.
TestRail also contains activity reports that are similar to what you are looking for but they would only show the activity per day (number of failed/passed/blocked etc. tests) and not the aggregate statistics.