JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bar" data-percentage="70,33"></div>
<div class="bar" data-percentage="90"></div>
<div class="bar" data-percentage="20"></div>
<div class="bar" data-percentage="100,8"></div>
<div class="bar" data-percentage="10,4"></div>

<div class="result"></div>

JavaScript

var dataSource;

$('.bar').each(function(index){
    dataSource = $(this).data('percentage');

    if (dataSource.indexOf(',') != -1) {
        dataSource = dataSource.replace(/,/g, '.');
    }

    $('.result').append(dataSource+"<br>");
})