How do I get a Golang Database connection pool to manage connections to multiple hosts in a cluster?

I'm setting up bi-direction replication between four PostgreSQL workers, and I'd like to have my Go database connection pool handle connections to all four. It ought to be able to create multiple connections to them all, randomly select one for any given query, and fail over when a connection drops. Is this doable in the Go database library? Or should I just use pgBouncer and not try to get database/sql or pgx to handle that balancing?