code: def next_object_id(self):
      object_ids = [
          int(oid)
          for oid in self.base_labels["openlabel"]["objects"].keys()
      ]
      if not object_ids:
          return "0"
      return str(max(object_ids) + 1)
  
imports: from collections import defaultdict
  import os
  import eta.core.serial
  import fiftyone.core.odm.dataset
label_desc: Use image node_id 7 for calling the OpenLABELLabels obj's underlying member method code with example usage: obj.next_object_id() and returns: str, str