Plugins necessary to integrate Specflow with Jira

Question

I want to integrate manual testing and automated testing in Jira.

I use Specflow in .Net with NUnit and Jenkins.

In Jira it's installed the Zephyr plugin:

Zephyr for Jira - Test Management for JIRA (Server) 2000 Users: Commercial License

From my research to integrate everything I will need also:

1. Cucumber for Jira (is this necessary?)

2. BDD feature for Zephyr should be enabled

3. Zephyr Squad plugin

Do I need something also for Jenkins?

Did I understand correctly? Is it another way to integrate them?