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The title explains it all. I'm fairly certain it would be very easy to do. All you have to do is check if the player is already in a party and if they aren't just put the code that makes one and then invite the person.
Hello. Thank you for your suggestion! I'll now bring it up to the rest of the poltergeists team so we can discuss it and come back with a response as soon as possible.
Hey!
We have decided to accept your suggestion and to put it on our to-do list, as we agree that this would be very useful and a nice quality of life change. Thank you for coming to us with your idea, any feedback is really appreciated!
I'm happy to let you know that this suggestion has been completed with today's Party Update! You can read about the entire update here. Sending an invite to a party now also creates a party! We hope you enjoy the new addition.
Thank you for making this suggestion and I hope you have a nice day!