code: def render_string(self, source: str, context: dict[str, Any]) -> str:
      return self.env.from_string(source).render(context)
  
imports: from __future__ import annotations
  import os
  from functools import partial
  from os import path
  from typing import TYPE_CHECKING, Any, Callable
  from jinja2 import TemplateNotFound
  from jinja2.loaders import BaseLoader
  from jinja2.sandbox import SandboxedEnvironment
  from sphinx import package_dir
  from sphinx.jinja2glue import SphinxFileSystemLoader
  from sphinx.locale import get_translator
  from sphinx.util import rst, texescape
label_desc: Use image node_id 3 for calling the BaseRenderer obj's underlying member method code with example usage: obj.render_string(source, context) and returns: self