Datatables get columns structure automatically with ajax object datasource

How could I get columns structure automatically with this kind of datatable? The idea is that there will be different number and order of columns depending of the params that I send to the server using the ajax data source with objects.

(I only need the base names of the columns, I don't need the translated ones)

here is my code simplified:

var tableId = 'tableId';
var tableName = jQuery('#' + tableId).DataTable({
    language: dataTablesTexts,
    pagingType: 'full',
    lengthMenu: [
        [5, 10, 25, 50, -1], 
        [5, 10, 25, 50, 'All'],
    ],
    searching: true,
    ordering: true,
    aaSorting: [],
    paging: true,
    select: false,
    info: true,
    responsive: true,
    ajax: {
        type: 'POST',
        url: '/historic/getTasks',
        data: function (d) {
            return $.extend( {}, d, {
                token: localStorage.token,
                params: params
            });
        },
    dataSrc: ""
    },
    columns: [{
        data: 'name',
        title: lang.name
    }, {
        data: 'description',
        title: lang.description
    }, {
        data: 'edit',
        title: ''
    }]
});