Rails4 - How to add custom data attributes to body tag in ActiveAdmin

I am using activeadmin gem in my Rails4 app and just wondering how i can add custom attributes on my body tag or custom meta tag in my markup.There are few approaches :-

1. Override the layout and easily define helper/function to get the meta tag/body custom attributes.
2. Keep the default settings, just include custom js file in initializers/active_admin.js and let the js make an ajax call and make changes in the body tag and add some attributes.
3. Is there any other way..an easy one?

Thanks in advance.