How to set value of secret for connection to database

Questions
,
1

Hi, I want to

helm install kong2 kong/kong --values ./values_hybrid.yaml -n kong

and I want secure connection credentials in scret.
There are these parameter in value.yaml

# Configure the database connection.
database: "postgres"
pg_host: "your-existing-postgres-host"
pg_port: "5432"
pg_user: "your-postgres-user"
pg_password: "your-postgres-password"
pg_database: "kong"

but how do I set secret for connection to database?