Allow user to define their own Series in the Reports section

Currently, within Service Desk reports, the user is only able to choose the predefined series such as Tickets created, Resolved, etc.. Even though the user is able to define their own JQL. But it will nice to have the ability to define their own series. As for instance, if the user chose the Series to be Tickets created and then chose the JQL filter to include tickets which are in Unresolved status, The report will only show those tickets which were created AND still not resolved in that period of time.