And Goormoring to you, kind Sir (or Madam), whatever it may be. 
I believe in such case the only option would be to add this via 'Extras' as an additional field or additional table (depending on what is needed exactly). But you might run into the performance issues because then SELECT for additional data will be executed in a loop. Queries have some limitations, so in some cases a custom ABAP report is a better option.