List zigbee2mqtt in HA Sidebar

Configuration Frontend
1

I have HA running in Docker and am trying (as mentioned in guidance documents) to add zigbee2mqtt to the HA sidebar. I have added,

# Add container user interfaces to navigation menu
panel_iframe:
  zigbee2mqtt:
    title: "zigbee2mqtt"
    url: "http://192.168.2.30:8080"
    icon: mdi:zigbee
    require_admin: true

to my HA configuration.yaml file, and have restarted HA. However, the ‘zigbee2mqtt’ item is not displayed. What am I missing?

2

Attempted to apply solution (from kdem posted elsewhere).
settings > dashboards > add dashboard, at the bottom >web page
This successfully adds zigbee2mqtt to the sidebar, but when selected appears to initiate three sub-menued versions of zigbee2mqtt. Still looking for the ‘best practice’.