Yes, you can. It's not as clever as the Enyaq (being 7 years older), you have a choice of demist, heat or cool. It just runs the fans at full speed and the heater or aircon at full power (4kW) for 10, 20 or 30 minutes. Generally you only need 10 minutes except in the depths of winter when 20 minutes works well to defrost the windscreen. You can only have one timer per day though which can be a pain. This all applies to the model I have (2015 GX4h), it's possible that the later ones with the 2.4 litre engine may have better software. There is a phone app, but it has to connect to the car via wifi (the car's own wifi) so you have to be within 20m or so of it. You can start a heat/cool session from the app too.
It'll come with a granny charger, but be aware that the heater uses more than that can supply (4kW heater, 2.3kW charger) so you will use a little bit of battery (not much in 10 minutes though).