code: def inserted_hs_indices(self):
          
          # ---don't do H&S insertions for CA and MR subvar dimensions---
          if self.dimension_type in DT.ARRAY_TYPES:
              return []
  
          return [
              idx
              for idx, item in enumerate(
                  self._iter_interleaved_items(self.valid_elements)
              )
              if item.is_insertion
          ]
docs: list of int index of each inserted subtotal for the dimension.
  
          Each value represents the position of a subtotal in the interleaved
          sequence of elements and subtotals items.