authentication.superuser.password field in the postgres.yml is stored in plain text

[sheel07]

we are seeing authentication.superuser.password field in the postgres.yml is stored in plain text even after having Kubernetes Secrets with base64 encoded password.

postgres@rdbms-pg-cluster-dev-1:~$ grep -i password postgres.yml
      password: ''
      password: RtttSedreSErSSErREreREEsSSSSSSSSsErERer
      password: Devloper123_
postgres@rdbms-pg-cluster-dev-1:~$

Is there any way in Zalando's Postgres Operator to have authentication.superuser.password field in encrypted form?

if encrytion is not possible within Zalando's Postgres Operator then, is there any other way to make postgres.yml more secure?