The solution "https://access.redhat.com/solutions/6842301" does not work for us. 
We are using the Crunchydata PostgreSQL Operator. When the PostgreSQL Operator creates the database cluster, it stores the credentials, hostname, dbname in a secret as described in https://access.crunchydata.com/documentation/postgres-operator/v5/tutorial/connect-cluster/So when we deploy the database, we have to read the data from the crunchydata secret and copy it to the external-database-secret for the ansible operator.
Please make the secret and the needed secret keys configurable, so the ansible operator uses the secret created by the postgresql-operator.