Hi,
We have Jira 8.20.x DataCenter. In the workflow, I have already set a post function that:
When certain Request Types arrive in Queue, Jira
Automatically assigns those issues to (User A).
Now that these issues are assigned to (User A), we want to automatically add a label to all of these issues that says "WORKEXAMPLE"
I am new to Jira and was unable to do it with triggers, so I tried in autmation and it would not allow me to customize the options needed. Someone recommended Scriptrunner but I am new to it as well.
We currently have Automation and Scriptrunner Apps available to us 
Can anyone possibly help?