code: def handle_post(self, name: str):
      self.names.append(name)
      return f"The name {name} was registered"
  
file_path: pytorch-lightning/docs/source-app/workflows/build_command_line_interface/post_example.py
imports: from lightning.app import LightningFlow, LightningApp
  from lightning.app.api import Post
label_desc: Use image node_id 3 for calling the Flow obj's underlying member method code with example usage: obj.handle_post(name) and returns: str, name, str