code: def update_metadata(self, metadata_dict):
      self.base_labels["openlabel"]["metadata"].update(metadata_dict)
  
imports: from collections import defaultdict
  import os
  import eta.core.serial
  import fiftyone.core.odm.dataset
label_desc: Use image node_id 4 for calling the OpenLABELLabels obj's underlying member method code with example usage: obj.update_metadata(metadata_dict) without return types