PMM and postgres RDS

I want to add postgres RDS in PMM, please let me know if this is possible and help me with the steps to configure.

You should be able to add PostgreSQL Exporter for RDS Instance

https://www.percona.com/doc/percona-monitoring-and-management/pmm-admin.html

See “external metrics”
pmm-admin add external:metrics postgresql 192.168.200.1:9187 You would however need a host to run your “exporters” at this point.