I've used Jira in a couple of jobs in the past and historically something they've always wanted to do was be able to attach some kind of "customer" or "client" name to a work item so that they could easily report / extract a list of tasks common to that client. As a developer, often I would have many tasks in my board across several of that company's clients and it made my life easier to have a common share-able filter so that I could only look at company "Y" tasks.
While I know of only one way to do this, making a custom variable and attaching it to the appropriate schema or screen, maintaining the list was cumbersome to get to and maintain, and of course often others did not have permissions to do this...I did, so I managed them.
Is there a better way to do this?