iSmartGate Garage opener - show if open or closed

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Hi.
I’m new to Home Assistent, so maybe this is obvious for someone in here.

I have a iSmartGate Garage opener, and I have made a small card for it, looking like this:

type: entities
entities:
  - entity: cover.garasjeport
title: Garasjeport

But is there a way to display if the port is opened or closed?
I can see in the github page here https://github.com/home-assistant/core/tree/dev/homeassistant/components/gogogate2 that there is a function:

@property
    def is_closed(self):
        """Return true if cover is closed, else False."""
        door = self._get_door()

        if door.status == DoorStatus.OPENED:
            return False
        if door.status == DoorStatus.CLOSED:
            return True

        return None

But I don’t know how to use it…
Has anyone done this, or something similar?

Thanks.