The Add user in custom field to group post function allows you to add a user set in a User Picker custom field to a Jira user group when a workflow transition is executed.
Select a User Picker custom field (single user) from which the user will be added to a Jira user group in the User Picker custom field field
Select a Jira user group to which the user will be added in the Group field
Activate the JQL condition option and define the JQL query that has to be met by the issue in order to execute the post function (e.g. “type = Bug and Priority = Blocker”)
Activate the Executor condition option if you want the post function to be executed only if the user is or isn’t in a certain Jira user group or project role
Select if The executor has to be or can’t be a member of a certain Jira user group or project role
Select a Jira user group in the Group field if Group was set in the member of a field
Select a project role in the Project role field if Project role was set in the member of a field