How can I list all users that have worked on an issue

[kororos]

I would like to get a list of all users that have ever been assigned to an issue. And I want to do this for a number of issues. More specifically, I have used the following query:

assignee was in membersof("my-group")

to retrieve the relevant issues. But when I export them to Excel, I want to see all the people who were ever assigned to these issues.

Is there a way to do this?

Thank you

[GabrielleJ]

JIRA does not natively store whoever was assigned to an issue to any custom field that's it will not be available in the "Export to Excel" details. 

One way to do this is to use "Watchers". Put in a logic in your workflow to restrict "Assigning" issues to a workflow transition and in that transition put in a post-function to automatically add the assignee as a Watcher to that issue OR use a custom field that can be updated with the assignee. If that will not work for you, just parse the issue history.