Cross domain tracking okgrow:analytics

I’m currently using okgrow:analytics to manage google analytics. I would like to setup Cross domain tracking from my marketing/landing page domain to my application galaxy domain. I couldn’t find anything in the okgrow:analytics documentation on how to add the required information. Can someone point me in the right direction?

ga('create', 'UA-XXXXXXX-Y', 'auto', {'allowLinker': true}); ga('require', 'linker'); ga('linker:autoLink', [''] );