How to use NTLM authentication in a Call REST service

In the REST module you can use for NTLM authentication the java action 'registerNTCredentials' to enter the username, password and domain. In Mendix version 6.8.1 you have now the activity "calll REST Service. Here only http authentication is available. Is it also possible to use NTLM authentication with this new activity? If so how should I do this?

Thanks!