I have created a process to create report with ReportServer.net platform.
You can create drop down list with dependency query selection, free text with default value.
You just only create report from report server (getting program from reportserver.net) and set parameters. Then, it can show report on processmaker.
two task are created:
1. Register report -- create a report search criteria, linkage with reportserver.
2. Report generator -- Show report result by wanted selection...