There is a feature request open at: https://github.com/usablica/intro.js/issues/57 So I would say it's safe to say you can't do this.
What you can do is create a dummy transparent div with position: absolute
and set up the location and size by javascript and then hightlight this.
Check it out here: https://jsfiddle.net/s848n5hs/2/
$('tr:first-child td').each(function(i) {
$('.col' + (i + 1) + '_intro')
.addClass('intro_div')
.css('top', $(this).offset().top)
.css('left', $(this).offset().left)
.css('width', $(this).outerWidth())
.css('height', $(this).closest('table').height())
})
introJs().start();