Panel_iframe usage with groups

I created a panel of google calendar called BRJM. I can see it but would like to add it to a group together with for instance some switches.

in the configuration.yaml:

panel_iframe:
google_calendar:
title: ‘BRJM’
url:

and in the groups.yaml:

livingroom:
name: Living
entities:
- switch.neo_coolcam_power_plug_12a_switch_2
- light.living_room
- switch.FrontDoorLight
- sensor.livingpressure
- sensor.livingtemp
- google_calendar.BRJM

But it doesnt show next to the switches.