Extensible Rmgr for Table Ams

Im working on my postgres FDW extension, to support logical replication I need to use Custom WAL resource manager. In postgres extensions have the flexibility to register their resource managers in RmgrTable[]. But Like RmgrTable[] we have another resource manager related table RmgrDescTable[], there we didn't have the flexibility to register our 

1) rm_name

2) rm_desc

3) rm_identify

GetRmgrDesc() are widely used in XLogDumpDisplayRecord() and XLogDumpDisplayStats() in pg_waldump.c. In function GetRmgrDesc() for custom resource managers by the default they are assign 

       1) rm_desc = default_desc

       2) rm_identify = default_identify

Suggest some ways to register my own rm_desc and rm_identify in RmgrDescTable[]?

Attaching the Custom WAL resource managers commit for the reference:

Thanks and regards

Pradeep Kumar