ft_bucketizer with splits_array

General
1

I am using sparklyr ml function

I want to ft_bucketizer some features with a split_conf file.

raw_ft_wide_sdf %>% 
      ft_bucketizer(input_cols = feature_list,
                output_cols = paste0("bin_",feature_list),
                uid = "user_id",
                splits_array = perctl_conf %>% 
  purrr::map(unlist,use.names=T) #breaks,
                )

however, I dont know how to pass splits_array parameter correctly, and fail to find the answer through internet.