Add a group as participants in Jira Service Desk
<iframe width="560" height="315" src="https://www.youtube.com/embed/rntrZeUeo8g" frameborder="0" gesture="media" allow="encrypted-media" allowfullscreen></iframe>
Call this script from a workflow transition post-function. The script adds a group to the Service Desk participants.
string [] groups = {"auto-assign-users"};
customfield_10301 = usersInGroups(groups);