docs: def get_filename_filled_with_checked_labels(self, labels=None):
          """ Fill used labels into filename """
          if labels is None:
              labels = self.slab_wg.action_check_slab_ui()
          string_labels = imma.get_nlabels(slab=self.slab_wg.slab, labels=labels, return_mode="str")
          filename = self.vtk_file.format(
              "-".join(string_labels))
          return filename