A plugin that displays dependencies (specifically the "is blocked by" issue links) directly on the Backlog view of the Scrum board is Dependency Risk for JIRA. I know it doesn't (yet) display anything directly on the card, but does the plugin help with your need to show blockers?
(Disclaimer: I am the developer of the Dependency Risk add-on.)
This approach requires you to have the JIRA administrative rights. The main aim of this article is to help you achieve an organized, easy-to-maintain workflows in your JIRA instance thereby, reducin...
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