Как добавить в форму поле size в ms2form?

<input type="text" name="size" class="form-control" placeholder="Введите размер...">

<form class="well create" method="post" action="" id="ms2form" role="form" data-reset="true">
  <input type="hidden" id="ms2formFormKey" name="form_key" value="[[+formKey]]">
  <input type="hidden" name="pid" value="0">
  <input type="hidden" name="parent" value="[[+parent]]">
  <input type="hidden" name="published" value="1"/>
  <input type="hidden" name="hidemenu" value="0"/>
  <input type="hidden" name="redirectPublished" value="[[+redirectPublished]]"/>
  <input type="hidden" id="ms2formSize" value="[[+size]]"/>
  <input type="hidden" id="ms2formSezon" value="[[+sezon]]"/>
  <input type="hidden" name="tv3" value="[[!+modx.user.id:userinfo=`city`]]"/>
  <input type="hidden" name="tv5" value="[[!+modx.user.id:userinfo=`state`]]"/>
	<div class="mb-3">
    <label>[[%ms2form_categories]]</label>
    
    <input type="hidden" class="form-control" id="ms2formSections">
  </div>
	<div class="input-group mb-3">
		<div class="input-group-prepend">
			<span class="input-group-text px-4" id="basic-addon1">25</span>
		</div>
		<input type="text" class="form-control" id="ms2formPagetitle" name="pagetitle" value="" placeholder="[[%ms2form_pagetitle]] *" aria-label="Заголовок" aria-describedby="basic-addon1">
	</div>
  <div class="mb-3">
    <label>Размеры</label>
    
    <input type="text" name="size" class="form-control" placeholder="Введите размер...">
  </div>