Webform in a Paragraph (D8)

MY_MODULE.module

<?php

use Drupal\webform\Entity\Webform;

/**
 * Implements hook_entity_extra_field_info().
 */
function MY_MODULE_entity_extra_field_info() {
  $extra['paragraph']['PARAGRAPH_TYPE']['display']['FIELD_NAME'] = [
    'label' => t('Form'),
    'weight' => 0,
    'visible' => FALSE,
  ];
  return $extra;
}

/**
 * Implements hook_entity_view().
 */
function MY_MODULE_paragraph_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) {
  if ($display->getComponent('FIELD_NAME') && ($webform = Webform::load('WEBFORM_ID'))) {
    $build['FIELD_NAME'] = [
      '#type' => 'container',
      '#attributes' => ['class' => ['field', 'field--name-extra-FIELD-NAME']],
      'title' => [
        '#type' => 'html_tag',
        '#tag' => 'h2',
        0 => ['#markup' => $webform->label()],
      ],
      'content' => [
        '#type' => 'webform',
        '#webform' => $webform,
        '#default_data' => [],
      ]
    ];
  }
}