code: def _render(item: ConfigItem, indent: str = "") -> str:
      
      optional = item.default_value != _NO_DEFAULT
  
      if is_configurable(item.annotation):
          rendered_annotation = f"{item.annotation} (configurable)"
      else:
          rendered_annotation = str(item.annotation)
  
      rendered_item = "".join([
              # rendered_comment,
              indent,
              "// " if optional else "",
              f'"{item.name}": ',
              rendered_annotation,
              f" (default: {item.default_value} )" if optional else "",
              f" // {item.comment}" if item.comment else "",
              "\n"
      ])
  
      return rendered_item
docs: Render a single config item, with the provided indent