How to assign an incident to a group rather than to a person through email when making an API call

Hi guys,

I am creating a google form which creates a SAmanage incident when the form submits and using Apps Script to call the SAmanage api. Here is the doc: https://apidoc.samanage.com/#tag/Incident. In the sample payload, there is a property called assignee that takes in an object which only has the property "email". While this is useful, I was wondering how can I assign a ticket to a group rather than a singular person. 

Thanks!