Configure Postgresql sslrootcert with Spring Cloud Connectors & HikariCP

Question

I'm currently trying to setup a datasource (Postgresql) on my SpringBoot 2.1.1 application with Spring Cloud Connectors (my application is hosted on PCF). I need to configure the path to my sslrootcert (which is not specified in the jdbc url provided by the service broker we are using on PCF).

I've tried to configure it that way :

@Bean
public DataSource dataSource() {
    DataSourceConfig dataSourceConfig = new DataSourceConfig(null, new DataSourceConfig.ConnectionConfig("sslrootcert=/home/vcap/app/.postgresql/root.crt"), Collections.singletonMap("sslrootcert", "/home/vcap/app/.postgresql/root.crt"));
    return connectionFactory().dataSource(dataSourceConfig);
}

but my sslrootcert property is always ignored and fall back to the default ~/.postgresql/root.crt

I can't find anything in the documentation regarding a way of setting this kind of driver specific property.

Any kind of help would be appreciated.