How to create data layer for Google tag manager

Hi,

I want to create data layer for Google Tag Manager which will be a script with dynamic data in body section of all pages.

window.dataLayer = window.dataLayer||[];

window.dataLayer.push({

           'content.group':    'value', // Content Group

           'content.level1':    'value', // Content Level 1

           'content.level2':    'value', // Content level 2

           'content.pagetype':            'value', // Page Type

           'customer.loginstatus':         'value', // Customer Login Status

           'customer.id':         'value', // Customer ID

           'customer.contracttype':      'value', // Customer Contract Type  

});

Can anyone please explain how can we implement it(through SitePageData etc) with an example.

Thanks in advance.

Best Regards,

Sanket Mahimkar