wls_install::utils::fmwclusterjrf convert existing cluster to a ADF/JRF cluster. You need to create a wls cluster with some managed servers first.

wls_install::utils::fmwclusterjrf{'WebCluster':
  domain_name          => "adf_domain",
  jrf_target_name      => "WebCluster",
  opss_datasource_name => "opss-data-source" #optional,
  log_output           => true,,
  }