Is CA_CERT available via the connection pool variable syntax in App Platform?

Dear Community!

We’re connecting to a Managed PostgreSQL database through a PgBouncer connection pool in App Platform. For most connection parameters we use the pool-scoped variable syntax:

${<db-name>.<pool-name>.HOSTNAME}
${<db-name>.<pool-name>.PORT}
${<db-name>.<pool-name>.USERNAME}
...

However, we also need to pass the CA certificate to verify TLS connections (rejectUnauthorized: true). The documentation lists CA_CERT as a bindable variable, but only shows it in the context of direct cluster references:

${<db-name>.CA_CERT}

The pool variable section only shows DATABASE_URL as an example, and CA_CERT is never mentioned there.

Our question: Does the pool-scoped syntax support CA_CERT? In other words, is ${<db-name>.<pool-name>.CA_CERT} a valid reference, or should we always use the cluster-level ${<db-name>.CA_CERT} for the certificate — even when connecting through a pool?

If CA_CERT is not available via the pool syntax, is the cluster-level reference still the right cert to use when the actual connection goes through PgBouncer?

Thanks for the answers in advance! Keep on Coding! Gulyas Bendeguz