waitAndAddCommas.js

var columnKey = "mileage"; //Give your column key here

function runAll (){
    $table.on('ninja_table_all_chunk_loaded', () => {
        setTimeout(
          function() 
          {
            $('tbody .ninja_clmn_nm_'+columnKey).each(function(){
                $(this).text( $(this).text().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,") ); 
            });
          }, 1000);
    })
}

runAll();

$table.on('after.ft.filtering', function() {
    runAll();
});
$table.on('after.ft.paging', function() {
    runAll();
});