code: def to_json(self) -> dict[ID, ID]:
      return {
          root.id: elementid for root, elementid in self._roots.items()
      }
  
imports: from __future__ import annotations
  import logging
  import re
  from contextlib import contextmanager
  from typing import TYPE_CHECKING, Any, Iterator, Sequence
  from weakref import WeakKeyDictionary
  from ..core.types import ID
  from ..document.document import Document
  from ..model import Model, collect_models
  from ..settings import settings
  from ..themes.theme import Theme
  from ..util.dataclasses import dataclass, field
  from ..util.serialization import make_globally_unique_css_safe_id, make_globally_unique_id
label_desc: Use image node_id 6 for calling the RenderRoots obj's underlying member method code with example usage: obj.to_json() and returns: unknown