JSFiddle - React, Tailwind, and code Playground

HTML

<div class='input'>
Morbi leo risus, porta ac consectetur ac, vestibulum at eros.
Donec id elit non mi porta gravida at eget metus. Nulla vitae
elit libero, a pharetra augue. Nullam id dolor id nibh
ultricies vehicula ut id elit. Vivamus sagittis lacus vel
augue laoreet rutrum faucibus dolor auctor.
</div>
<div class='result'>
</div>

JavaScript

$('div.result').html( "" )
$('div.input').each( function(){
    var lines = $(this).html().replace(/^\s+/, '').replace(/\s+$/,'').split("\n")
    $('div.result').append("<p><kbd>" + lines[lines.length-1].length + "</kbd>: <i>"+lines[lines.length-1]+"</p>" )       
    
})