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Ok here is one way to do it does however involve creating a custom twig Extension. its not to hard and there are a few youtube videos on the subject ... 
for others it is good to note that custom Twig Extensions has replaced php input fields in older versions of Drupal. 

in a nut shell you create a custom module, 
you add a MODULENAME.services.yml  file.

in it you put...

services:
modulename.getWebformDescription:
  class: Drupal\modulename\getWebformDescriptionTwigExtension
  arguments: ['@entity_type.manager']
  tags:
    - { name: twig.extension }


then you need here is your class file (getWebformDescriptionTwigExtension.php)

&lt;?php

namespace Drupal\modulename;

use Drupal\Core\Entity\EntityTypeManagerInterface;

/**
 * Provides twig function getWebformDescription()
 */
class getWebformDescriptionTwigExtension extends \Twig_Extension {

  /**
   * Load entity type manager.
   *
   * @var EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * {@inheritdoc}
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this-&gt;entityTypeManager = $entity_type_manager;
  }

  /**
   * {@inheritdoc}
   */
  public function getName() {
    return 'getWebformDescription';
  }

  /**
   * {@inheritdoc}
   */
  public function getFunctions() {
    return [
      new \Twig_SimpleFunction('getWebformDescription',
        [$this, 'getWebformDescription'], [
          'is_safe' =&gt; ['html'],
        ]),
    ];
  }

  /**
   * Provides getWebformDescription function to Twig templates.
   *
   * Use example {{ getWebformDescription( webfrom_id) }}.
   *
   * @param string webfrom_id
   *   The webform id eg 'contact'
   */
  public function getWebformDescription($webfrom_id) : string {
    // Invoke __toString and cast to int.
    $webfrom_id = $webfrom_id-&gt;__toString();
    $webform_storage = $this-&gt;entityTypeManager-&gt;getStorage('webform');
    $webform = $webform_storage-&gt;load($webfrom_id);
    return $webform-&gt;get('description');
  }

}


after all that is done and the module is enabled you can then in views add the webform id field (and exclude it from display) 

then add a new custom field and look at the replacement patterns you will see 
some thing like {{webfrom_id}} ...

in that field you can then enter ... 

 {{ getWebformDescription(webfrom_id) }}


if stuck 
see stuff like https://medium.com/@thihathit/extending-custom-twig-extension-to-drupal-8-twig-extension-class-d4b99c2177ae

or google "create custom twig extension for drupal 8"