shiny for Python using add_layer for Popus from ipyleaflet

I want to use m.add_layer for Popus from ipyleaflet in shiny for python (as given here). However, it is not working as expected. My minimum working example is given below:

from shiny import App, render, ui
from shinywidgets import output_widget, reactive_read, register_widget
from ipywidgets import HTML
from ipyleaflet import Map, Marker, Popup

app_ui = ui.page_fluid(
    output_widget("m")
    )


def server(input, output, session):
    center = (52.204793, 360.121558)
    m = Map(center=center, zoom=9, close_popup_on_click=False)
    message1 = HTML()
    message1.value = "Try clicking the marker!"

# Popup with a given location on the map:
    popup = Popup(
    location=center,
    child=message1,
    close_button=False,
    auto_close=False,
    close_on_escape_key=False
    )
    
    m.add_layer(popup) # This line is not working
    register_widget("m", m)

app = App(app_ui, server)

Wondering what basic am I missing here?

from shiny for Python using add_layer for Popus from ipyleaflet