how to dynamically populate pdf with pdfmake node

// playground requires you to assign document definition to a variable called dd

var headers = {
    fila_0:{
        col_1:{ text: 'Faltas', style: 'tableHeader',rowSpan: 2, alignment: 'center',margin: [0, 8, 0, 0] },
        col_2:{ text: 'Fecha', style: 'tableHeader',rowSpan: 2, alignment: 'center',margin: [0, 8, 0, 0] },
        col_3:{ text: 'Descripción', style: 'tableHeader',rowSpan: 2, alignment: 'center',margin: [0, 8, 0, 0] },
        col_4:{ text: 'Cita con acudientes', style: 'tableHeader',colSpan: 2, alignment: 'center' }
    },
    fila_1:{
        col_1:{ text: 'Header 1', style: 'tableHeader', alignment: 'center' },
        col_2:{ text: 'Header 2', style: 'tableHeader', alignment: 'center' }, 
        col_3:{ text: 'Header 3', style: 'tableHeader', alignment: 'center' },
        col_4:{ text: 'Citación', style: 'tableHeader', alignment: 'center' },
        col_5:{ text: 'Cumplimiento', style: 'tableHeader', alignment: 'center'}
    }
}
var rows = {
    a: {
        peaje: '1',
        ruta: '2',
        fechaCruce: '3',
        hora: '4',
        valor: '5'
    },
    b: {
        peaje: '1',
        ruta: '2',
        fechaCruce: '3',
        hora: '4',
        valor: '5'
    }
}

var body = [];
for (var key in headers){
    if (headers.hasOwnProperty(key)){
        var header = headers[key];
        var row = new Array();
        row.push( header.col_1 );
        row.push( header.col_2 );
        row.push( header.col_3 );
        row.push( header.col_4 );
        row.push( header.col_5 );
        body.push(row);
    }
}
for (var key in rows) 
{
    if (rows.hasOwnProperty(key))
    {
        var data = rows[key];
        var row = new Array();
        row.push( data.peaje.toString() );
        row.push( data.ruta.toString()  );
        row.push( data.fechaCruce.toString() );
        row.push( data.hora.toString()  );
        row.push( data.valor.toString() );
        body.push(row);
    }
}

var dd = {
        pageMargins: [40,155,40,55],
        pageOrientation: 'landscape',
        header: function() {
            return {
                margin: 40,
                columns: [
                  {
                    },
                    { text:['Resumen disciplinario'], 
                            alignment: 'left',bold:true,margin:[-405,80,0,0],fontSize: 24}
                ]
            }
        },
        footer: function(currentPage, pageCount) {
            return { text:'Pagina '+ currentPage.toString() + ' de ' + pageCount, alignment: 'center',margin:[0,30,0,0] };
        },
        content: [
            //{ text: 'Tables', style: 'header' },
            '\nEl estudiante AGRESOTH NEGRETE JORYETH TATIANA - 901 - TARDE tiene 1 actas, con 1 faltas acomuladas y a manera de resumen descritas a continuación:\n\n',
            //{ text: 'A simple table (no headers, no width specified, no spans, no styling)', style: 'sta' },
            //'The following table has nothing more than a body array',
            {
                style: 'tableExample',
                table: {
                    widths: [ '*', '*', '*', '*', '*' ],
                    headerRows: 2,
                    // keepWithHeaderRows: 1,
                    body: body
                }
            }],
        styles: {
            header: {
                fontSize: 28,
                bold: true
            },
            subheader: {
                fontSize: 15,
                bold: true
            },
            quote: {
                italics: true
            },
            small: {
                fontSize: 8
            },
            sta: {
                fontSize: 11,
                bold: false,
                alignment: 'justify'
            }
        }
}