如何在python dash中点击按钮时添加下拉菜单的值？

import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output, State

app = dash.Dash(__name__)

app.layout = html.Div([
    html.Button('Add Dropdown Value', id='add-button', n_clicks=0),
    html.Div(id='dropdown-container'),
])

@app.callback(
    Output('dropdown-container', 'children'),
    [Input('add-button', 'n_clicks')],
    [State('dropdown-container', 'children')]
)
def add_dropdown_value(n_clicks, dropdowns):
    if n_clicks > 0:
        new_dropdown = dcc.Dropdown(
            options=[
                {'label': 'Option 1', 'value': 'option1'},
                {'label': 'Option 2', 'value': 'option2'},
                {'label': 'Option 3', 'value': 'option3'}
            ],
            value='option1'
        )
        dropdowns.append(new_dropdown)
    
    return dropdowns

if __name__ == '__main__':
    app.run_server(debug=True)