EMR Presto Use External Hive RDS Metastore

Hi, I have an EMR Presto Cluster on EC2 and an external hive metastore on a RDS Mysql instance in AWS. I've read some documentation about configuring an external metastore on Amazon Glue but nothing about how to enable the external RDS metastore for Presto. I was able to access the MySQL RDS database from the EMR Presto cluster, so it is not a network issue, and also tried several configurations, example:

[
    {
      "Classification": "hive-site",
      "Properties": {
        "hive.metastore.client.factory.class": "org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClientFactory",
        "javax.jdo.option.ConnectionURL": "jdbc:mysql://[instance]:[port]/[database]?createDatabaseIfNotExist=true",
        "javax.jdo.option.ConnectionDriverName": "org.mariadb.jdbc.Driver",
        "javax.jdo.option.ConnectionUserName": "[user]",
        "javax.jdo.option.ConnectionPassword": "[password]",
        "hive.metastore.uris": "thrift://[instance]:[port]/[database]"
      }
    }
]

[
  {
    "Classification": "presto-connector-hive",
    "Properties": {
      "connection-url": "jdbc:mysql://[instance]:[port]/[database]",
      "connection-user": "[user]",
      "connection-password": "[password]",
    }
  }
]

None of them have worked so far. What would be the required Presto configuration? Thanks in advance.