Someone already created a graph in jasper studio with a graph that shows the number of requests opened by day?
I´m trying but have no sucess.
This wont answer your full requirement, but some of the context around parameter values etc., might be of some help. Check out this thread: https://communities.ca.com/message/241933723-re-open-date-filter-in-out-of-box-active-request-list-report?commentID=2419… as well as https://communities.ca.com/message/241973736-re-jasper-studio-filtering-on-a-date-range?commentID=241973736#comment-2419…
Based on those if you are able to tweak your report and see some of the data that you are expecting, then you could look into charting them out in a graph.
Have you looked at this OOTB report? You could use and modify accordingly.