How to Adding Custom Admin Tabs using Deface

Hi,
I want to add custom tab(career) in spree admin panel. I used Deface for override but the custom tab was not updated.
I have created the career module and its URL is http://localhost:5000/admin/careers
but i want to add the career tab in below CMS in that admin panel.
Page look like https://i.imgur.com/9SyxQPP.png

The over ride Deface code is
Deface::Override.new(:virtual_path => “spree/layouts/_main_nav_bar.html”,

:name => “admin_content_admin_tab_parser”,

:insert_bottom => “[data-hook=‘admin_tabs’]”,

:text => “<%= link_to ‘Career’, admin_careers_path %>”)

Anyone please give me the solution.

Thanks