How to get blog Google+ shareMessage (Template Data Tags)

We can get BLOG ID by using this DATA TAGS: <data:blog.blogId/> 

We can get Facebook, Twitter, Pinterest, Blog This sharing messages "Share 
to blabla" by using <data:top.shareToFacebookMsg/>, 
<data:top.shareToTwitterMsg/>

*But there is nothing for Google+ message, *
I tried <data:top.shareToGooglePlusMsg/>, <data:top.shareToGoogleMsg/>
These tags aren't working, return nothing

I found this javascript in generated Blogger template:  
(rest omitted for clarity) 



_WidgetManager._SetDataContext([{
    'name': 'blog',
    'data': {
        'blogId': '3580069', 
        'bloggerUrl': 'https://www.blogger.com',
        'title': 'Analytics Blog',
        'pageType': 'index',
        .
        .
        'sharing': {      <-- how to get data from this object
            'platforms': [{
                'name': 'Get link',
                'key': 'link',
                'shareMessage': 'Get link',
                'target': ''
            }, {
                'name': 'Facebook',
                'key': 'facebook',
                'shareMessage': 'Share to Facebook',
                'target': 'facebook'
            }, {
                'name': 'Google+',
                'key': 'googlePlus',
                'shareMessage': 'Share to Google+',   <-- how to get this 
shareMessage
                'target': 'googleplus'
            }],
            'googlePlusShareButtonWidth': 300,
            'googlePlusBootstrap': '\x3cscript 
type\x3d\x22text/javascript\x22\x3ewindow.___gcfg \x3d {\x27lang\x27: 
\x27en\x27};\x3c/script\x3e'
        }
    }
}])   

The object name & data are used in DATA TAGS <data:blog.blogId/>, 
<data:blog.pageType/>, <data:blog.title/> and more..
.
I can use almost everything from inside BLOG:DATA Objecs, except from 
inside "sharing{}" object,


QUESTIONS:

   1. Is there any ways to get data from inside 'sharing{}' object, 
   especially for Google+ shareMessage 
   2. In Javascript object we can use index of array: 
   sharing.platforms[0].shareMessage to get "Get link"..... 
   *How to do it in Blogger Template Tag? *









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