How to add custom field on backlog screen http://prntscr.com/cbpxo2 ?
Yes, it's possible, you can do that in Card Layout section when you configure the Board.
http://blogs.atlassian.com/2014/09/jira-agile-6-6-now-available/
and here - https://confluence.atlassian.com/jirasoftwarecloud/customizing-cards-764478020.html (Card layout)
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