Hi Sindhu,
In NWBC there is no detailed report as such but you can make use of these tables and can pull the report.
GRACREQ
GRACREQOWNER - This will give Creator, Manager and Requestor details. If your role owner is standard role owner agent then you can gets the details from table GRACROLEAPPRVR using the role names from GRACREQPROVLOG
GRACREQPROVLOG
Finding current approvers, etc will depend on what you MSMP Agent definitions are, etc. You might find it easier to trace the access request in ST05/STAUTHTRACE and look at the SQL statements, or look at the MSMP Instance Runtime report and leverage the code
Regards,
Madhu.