code: def as_json(self) -> str:
      return json.dumps(self.apps)
  
imports: import json
  from datetime import datetime
  from typing import List, Optional
  from lightning_cloud.openapi import Externalv1LightningappInstance, Externalv1Lightningwork, V1LightningappInstanceState, V1LightningappInstanceStatus
  from rich.console import Console
  from rich.table import Table
  from rich.text import Text
  from lightning.app.cli.core import Formatable
  from lightning.app.utilities.cloud import _get_project
  from lightning.app.utilities.network import LightningClient
label_desc: Use image node_id 3 for calling the _AppList obj's underlying member method code with example usage: obj.as_json() and returns: json