JSFiddle - React, Tailwind, and code Playground

HTML

<select id="sel">
<option value="0">Option1</option>
<option value="1">Option2</option>
<option value="2">Option3</option>
<option value="3">Option4</option>
</select>

JavaScript

var opt = 'Option1';
if ($('#sel option:contains('+ opt +')').length) {
   alert('This option exists')
}