JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="nav nav-list">
					<li>
						<label class="tree-toggler nav-header"><a href="#">Ассортимент</a></label>
						<ul class="nav nav-list tree">
							<li><a href="#">Link</a></li>
							<li><a href="#">Link</a></li>
						</ul>
					</li>
					<li>
                        <label class="tree-toggler nav-header"><a href="#">Ассортимент</a></label>
						<ul class="nav nav-list tree">
							<li><a href="#">Link</a></li>
							<li><a href="#">Link</a></li>
						</ul>
					</li>
				</ul>

JavaScript

$(document).ready(function () {
    $('label.tree-toggler').click(function () {
        $(this).parent().children('ul.tree').toggle(300);
    });
});