code: def _add_hla_files(data):
      
      if "hla" not in data:
          data["hla"] = {}
      align_file = dd.get_align_bam(data)
      hla_dir = os.path.join(os.path.dirname(align_file), "hla")
      if not os.path.exists(hla_dir):
          hla_files = None
      else:
          hla_files = sorted(list(glob.glob(os.path.join(hla_dir, "%s.*.fq" % os.path.basename(align_file)))))
      data["hla"]["fastq"] = hla_files
      return data
docs: Add extracted fastq files of HLA alleles for typing.