JSFiddle - React, Tailwind, and code Playground
HTML
<div id="elt1">
elt 1
</div>
<div id="elt2">
elt 2
</div>JavaScript
$(function(){
$('#elt1').data('foo','bar1')
.on('mouseenter', function() {console.log($(this).data('foo'));});
$('#elt2').attr('data-foo','bar2');
})