How do I access the SNI extension in HTTP4?

[Ioannis Mavroukakis]

Hello everyone.
I've been banging my head against a brick wall trying to figure out a 
way to configure SNI on the http4 component.

According to 
https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html#SNIExtension 
the way to do it is as follows (emphasis, mine)

SSLEngine sslEngine = sslContext.createSSLEngine("172.16.10.6", 443);
SNIHostName serverName = new SNIHostName("www.example.com");
List<SNIServerName>  serverNames = new ArrayList<>(1);
serverNames.add(serverName);
sslEngine.setSSLParameters(params);

For the life of my however, I cannot figure out a way to do this, either 
via the DSL (preferable) or programmatically. With respects to the 
programmatic configuration, should I be using HttpClientConfigurer ?

TIA,

Ioannis