How do I specity authentication type in httr2?

In httr, I could specify the authentication type with the type argument to authenticate.

authenticate(user, password, type = "basic")

type of HTTP authentication. Should be one of the following types supported by Curl: basic, digest, digest_ie, gssnegotiate, ntlm, any. It defaults to "basic", the most common type.

How do I specify the type in httr2? I need to specify "ntlm", but there is no type argument to httr2::request, and there is a req_auth_basic() function, but no req_auth_ntlm.