How to use NTLM Authentication using ghql in R

Question

Hi I'm trying to connect to my Graphql controller that authenticates through ntlm using an R script and the ghql library. The trouble I'm having is the only authorization examples I've found use tokens like so.

token <- Sys.getenv("GITHUB_GRAPHQL_TOKEN")
con <- GraphqlClient$new(
    url = "https://api.github.com/graphql",
          headers = list(Authorization = paste0("Bearer ", token))
)

But I need to use ntlm credentials. Has anyone run across a way to use ntlm credentials when setting up the GraphqlClient?