Welcome to the community.
Here you can find the supported fields for the was Operator.
You can not use the operator with other fields.
It requires the indexing and search code in the background to support that type of field. As yet, the core code doesn't support custom fields and only some of the system fields.
I'm afraid to make it work, you'd need to code for it in the core of Jira.
Hello Community! I hope you've been enjoying the 🍂Apptoberfestivities🍂 (I know I have!) The event is heating up next week with a series of virtual events that we're calling the 🍻🍂Partner App ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events