Got It! Just had to add htmlContent to pushpinOptions
var pushpinOptions = {icon: '/assets/greenpin.png',
visible: true,
htmlContent: '<div style="position: absolute; text-align: center; width: 100%; font-family: Arial, Helvetica, sans-serif; font-size: 10pt; font-style: normal; font-variant: normal; font-weight: bold; line-height: normal; color: rgb(255, 255, 255); left: 0px; top: 5px; ">'+alphas[i]+'</div>'
};