def select_context(
        cls, app: Optional[Union[BaseQueryEngine, BaseChatEngine]] = None
    ) -> serial_utils.Lens:
        """
        Get the path to the context in the query output.
        """
        return cls.select_outputs().source_nodes[:].node.text

        Get the path to the context in the query output.
        
src/apps/llamaindex/trulens/apps/llamaindex/tru_llama.py