Cost Tracker for Jira Cloud allows you to track the issue cost.
To do it, navigate to any issue you want to get the cost and click on the Cost Tracker app icon that locates below the issue summary.
Once activated, the App widget will be loaded below the issue description.
It shows the list of all users who have reported their time to a particular Jira issue, their work log, and cost as work log multiplied by the user’s rate.