var D = document;
let D = document;
const D = document;

let a = D.querySelector('.modalTmp form').getAttribute('data-fetchit')

let a = D.querySelector('.modalTmp form').getAttribute('data-fetchit')
// или
let a = D.querySelector('.modalTmp form').dataset.fetchit

if (FetchIt === undefined){
    D.querySelector('head').append('<script src="/assets/components/fetchit/js/fetchit.js" defer=""></script>');
}
if(!empty(FetchIt)){
    let a = D.querySelector(".modalTmp").querySelector('form').getAttribute('data-fetchit')
    FetchIt.create({
        action: a,
        assetsUrl: "/assets/components/fetchit/",
        actionUrl: "/assets/components/fetchit/action.php",
        inputInvalidClass: "is-invalid",
        customInvalidClass: "",
        clearFieldsOnSuccess: true,
        pageId: hashp,
    });
}

const fetchitInstance = new FetchIt(form: HTMLFormElement, config: {
  action: string,
  assetsUrl: string,
  actionUrl: string,
  inputInvalidClass: string,
  customInvalidClass: string,
  clearFieldsOnSuccess: boolean,
  pageId: number,
});

// или

FetchIt.create(config: {
  action: string,
  assetsUrl: string,
  actionUrl: string,
  inputInvalidClass: string,
  customInvalidClass: string,
  clearFieldsOnSuccess: boolean,
  pageId: number,
});

<div class="cookie-message js-cookie-message">
    <div class="container">
        <div class="cookie-message-inner">
            <div class="cookie-message-text">
                We use cookies to enhance your experience. 
            </div>
            <button class="button js-cookie-message-confirm">OK</button>
        </div>
    </div>
</div>
<script>
const el = document.querySelector('.js-cookie-message');
    if (!localStorage.getItem('cookieAccept') || localStorage.getItem('cookieAccept') == 0) {
        el.style.display = 'block';
        el.querySelector('.js-cookie-message-confirm').addEventListener('click', (e) => {
            localStorage.setItem('cookieAccept', 1);
            el.style.display = 'none';
        }, true);
    } else {
        el.style.display = 'none';
          
    }
</script>

<?php
$tvId = "TV id";
$tvr = $modx->getCollection('modTemplateVarResource', array(
  'tmplvarid' => $tvId,
  'contentid:IN' => [1,2,3]//список ИД ресурсов
));
foreach($tvr as $tv){
    $value = json_decode($tv->get('value'), 1);
    foreach($value as $item){
        echo $item['title'];
    }
}