code: def say_hello():
      return {"message": "Hello!"}
  
file_path: apiflask/examples/basic/app.py
imports: from apiflask import APIFlask, Schema, abort
  from apiflask.fields import Integer, String
  from apiflask.validators import Length, OneOf
label_desc: Use image node_id 1 for calling a global function with example usage: say_hello() and returns: dict