JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="price-list">
  <li>
    <input type="radio" name="radio" id="product1" data-price="100" value="product1" checked="checked">
    <label for="product1"><span>Product 1</span></label>
  </li>
  <li><input type="radio" name="radio" id="product2" data-price="110" value="product2"><label for="product2"><span>Product 2 [+ 10 $]</span></label></li>
  <li><input type="radio" name="radio" id="product3" data-price="110" value="product3"><label for="product3"><span>Product 3 [+ 23 $]</span></label></li>
</ul>

<ul class="price-list">
  <li>
    <input type="radio" name="radio2" id="product4" data-price="100" value="product4" checked="checked">
    <label for="product1"><span>Product 1</span></label>
  </li>
  <li><input type="radio" name="radio2" id="product5" data-price="110" value="product5"><label for="product2"><span>Product 5 [+ 15 $]</span></label></li>
  <li><input type="radio" name="radio2" id="product6" data-price="120" value="product6"><label for="product3"><span>Product 6 [+ 25 $]</span></label></li>
</ul>

JavaScript

$(function() {
    $('.price-list input[type=radio]').change(function() {
        var _radioObj = $(this);
        var _currentPrice = _radioObj.attr('data-price'); // or .data('price');

        $.each(_radioObj.closest('ul.price-list').find('input[type=radio]'), function() {
            var _span = $(this).parent('li').find('span');
            var _count = parseFloat($(this).attr('data-price')) - parseFloat(_currentPrice);
            _count = _count > 0 ? '+ ' + _count : _count.toString().replace('-', '- ');
            var _newContent;
            
            if(_count == 0)
            {
                if(_span.html().indexOf('[') > 0)
                    _span.html(_span.html().substring(0, _span.html().indexOf('[') - 1));           
               else
                   _span.html(_span.html());  
            } else {
                if(_span.html().indexOf('[') > 0)
                    _span.html(_span.html().substring(0, _span.html().indexOf('[') - 1) + ' [' + _count + ' $]');            
               else
                   _span.html(_span.html() + ' [' + _count + ' $]');       
            }
        });
    });
});