How to use the MGMTDB on the domain service cluster ?

First, how to locate the relationship between the PDB in MGMTDB and the client database that corresponds to the service?

For example:

SQL> show pdbs;

  CON_ID CON_NAME            OPEN MODE RESTRICTED

---------- ------------------------------ ---------- ----------

     2 PDB$SEED            READ ONLY NO

     3 GIMR_DSCREP_10         READ WRITE NO

     4 GIMR_CLUREP_20         READ WRITE NO

     5 GIMR_CLUREP_30         READ WRITE NO

     6 GIMR_CLUREP_40         READ WRITE NO

$ crsctl get cluster configuration

Name        : domains-service-cluster

Configuration    : Cluster

Class        : Domain Services Cluster

Type        : flex

The cluster is not extended.

--------------------------------------------------------------------------------

    MEMBER CLUSTER INFORMATION

   Name    Version    GUID            Deployed Deconfigured

================================================================================

     clsdb2 19.0.0.0.0 a60d890289077f51ffb7cd93ba8ea994  YES    NO

     clsdb3 19.0.0.0.0 141852436a2e6f9dbf01fa4910d17d5f  NO    NO