Chartjs-Chart.js add icons like <i class='icon-peso'></i> to y-axis labels

Update your exist variables with below and try.

var barLabel = '<?php echo json_encode($ch3_arrDate) ?>';
var dataVal1 = '<?php echo json_encode($ch3_arrRevenue_conf) ?>';
var dataVal2 = '<?php echo json_encode($ch3_arrRevenue_tent) ?>';
var dateFilter = '<?php echo json_encode($ch3_arrDate2) ?>';