class_docstr: _AppManager implements API calls specific to Lightning AI BYOC apps.
code: def get_app(self, app_id: str) -> Externalv1LightningappInstance:
      project = _get_project(self.api_client)
      return self.api_client.lightningapp_instance_service_get_lightningapp_instance(
          project_id=project.project_id, id=app_id
      )
  
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 2 for calling the _AppManager obj's underlying member method code with example usage: obj.get_app(app_id) and returns: self