enqueue jQuery

I have the following code in a mu-plugin file that adds a couple of buttons with popup windows next to the add media button, it works great but after doing some reading I think I am supposed to enqueue the jQuery which I have tried to do but I’m not sure how to do it for the following:

add_action('media_buttons_context', 'add_my_custom_button');
function add_my_custom_button() {
?>
<script>
  jQuery(document).ready(function($) {
   $('.popup').click(function() {
     var NWin = window.open($(this).prop('href'), '', 'scrollbars=1,height=400,width=400');
     if (window.focus)
     {
       NWin.focus();
     }
     return false;
    });
});
  </script>
  <a href="https://example.com" class="popup button">test button 1</a>
  <a href="https://example.com" class="popup button">test button 2</a>
  <?php
}

Could anyone help me out, thanks.