RDS with IAM authentication using Hibernate in .net

I am trying to connect to my Aurora PostgresQL database using hibernate ORM. I was able to connect Using EF .net I am able to retrive the token like

var pw= Amazon.RDS.Util.RDSAuthTokenGenerator.GenerateAuthToken(host, port, username);

Then in my nhibernate config and connectionstring i replace the password with pw in this call:

 var connectionString = ShardManagerBuilder.RebuildConnectionString(nhibernateConfiguration);
 Console.WriteLine($"nhibernateConfiguration:{connectionString }");
  var fluentSessionFactory = Fluently.Configure(nhibernateConfiguration);
...
...
// build factory   
            return fluentSessionFactory.BuildSessionFactory();

The question: Is it even possible to use IAM authentication in the context off Hibernate? Thanks ps: the code work when i use username and password (not IAM AUTH)