Gitlab Helm Chart install with AWS RDS Aurora IAM authentication

I can see that Rails supports IAM DB authentication through the installation of gem pg-aws_rds_iam (see GitHub - haines/pg-aws_rds_iam: IAM authentication in Ruby for PostgreSQL on Amazon RDS). What I am having difficulty with is configuring the Gitlab Helm Chart to use this authentication method vice using a database password. Any help out there?