code: def on_click1(n_clicks):
      time.sleep(2)
      return f"Click {n_clicks}"
  
imports: from dash import Dash, Input, Output, dcc, html, page_container, register_page
  import time
  from tests.integration.long_callback.utils import get_long_callback_manager
label_desc: Use image node_id 3 for calling a global function with example usage: on_click1(n_clicks) and returns: str, n_clicks