如何在PHP Laravel中使用get（）在Select Query中添加假属性

$citizenship_2012 = Citizenship::select('provinces', 'year2012 AS measure')->get();

I want to display one of the column names as it is. The column/attribute name is year2012, but I want to display it as category =>year2012, so I'm trying to get the column name below.
Also, I want to merge it with the above select query, in which other attributes provide its value name.

// citizenships table
$years = Schema::getColumnListing('citizenships');  
$year_2012= 'category:'.'"'.$years[2].'"';

in Blade file:

var datasetChart = <?php echo preg_replace('/"([a-zA-Z]+[a-zA-Z0-9_]*)":/','$1:', $citizenship_2012); ?>;

Expected output:

{ 
  provinces: "Ontario",
  category: "year2017",
  measure: 19441.5648
}  

The problem is that year2017 given in category is also a column/attribute but I want to display it as above.