code: def get_all_chunk_ref_counts(self) -> Dict[str, int]:
      result = dict()
      for chunk_key, ref_count in self._chunk_ref_counts.items():
          if ref_count > 0:
              result[chunk_key] = ref_count
      return result
  
imports: import asyncio
  import itertools
  import logging
  from collections import defaultdict
  from typing import Dict, List, Optional
  from ....None import oscar
  from ....lib.aio import alru_cache
  from ...meta.api import MetaAPI
  from ...storage.api import StorageAPI
  from ..errors import TileableNotTracked
label_desc: Use image node_id 8 for calling the LifecycleTrackerActor obj's underlying member method code with example usage: obj.get_all_chunk_ref_counts() and returns: result