JSFiddle - React, Tailwind, and code Playground

HTML

<div class="select">
<input type="checkbox" /> к
</div>

<div class="select">
<input type="checkbox" checked /> к
</div>

<div class="select">
<input type="checkbox" /> к
</div>

<button>ok</button>

JavaScript

$('.select .heading').each(function() {
    $(this).data('defaultText', $(this).text());
});
$('.select .option input').change(function() {
    var $context = $(this).closest('.select');
    var $heading = $context.find('.heading');
    var $labels = $context.find('input:checked').closest('label');
    $heading.text($labels.size() ? $labels.text() : $heading.data('defaultText'));
});