JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0-beta.3/js/select2.min.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0-beta.3/css/select2.min.css">
<form action="" id="tagForm">
    <select multiple="true" name="choose_usr_email[]" id="choose_usr_email" class="form-control select2">
        <option value="Something">Something</option>
        <option value="Anything">Anything</option>
        <option value="Helo World">Helo World</option>
    </select>
    <button id=submit>submit</button>
</form>

<div class="jumbotron" id="output">
     <h3>Submitted tags:</h3>
</div>

JavaScript

$('#choose_usr_email').select2({
    tags: true,
    tokenSeparators: [",", " "]
});

$('#tagForm').submit(function(e){
    e.preventDefault();
    $.ajax({
        url: "/echo/html/",
        type: 'post',
        dataType: 'html',
        data: $('#tagForm').serialize(),
        
        success : function(responze){
            /////////// FOR DEMO ///////////
            $('#output').append('<br/>'+decodeURIComponent($('#tagForm').serialize()));
            ///////////////////////////////
        }
    });
});