NodeStoryParagraphImage.php

<?php
namespace Drupal\my_module\Plugin\GraphQL\Fields\Entity;
use Drupal\Core\Entity\EntityInterface;
use Drupal\graphql\GraphQL\Execution\ResolveContext;
use Drupal\graphql\Plugin\GraphQL\Fields\FieldPluginBase;
use GraphQL\Type\Definition\ResolveInfo;
/**
 * @GraphQLField(
 *   id = "node_story_field_paragraph_image",
 *   secure = true,
 *   name = "fieldImageFromParagraph",
 *   type = " FieldParagraphImageFieldImage",
 *   parents = {"NodeStory"}
 * )
 */
class NodeStoryParagraphImage extends FieldPluginBase {

  /**
   * {@inheritdoc}
   */
  public function resolveValues($value, array $args, ResolveContext $context, ResolveInfo $info) {
    if ($value instanceof EntityInterface) {
      $node = $value;
      $paragraph = $this->getParagraphFromNode($node);
      yield $parapraph->get('field_paragraph_image)->getValue();
    }
  }

}

/*
Example usage:
{
  nodeById(id: "1") {
    ... on NodeStory {
      fieldImageFromParagraph {
        alt
        title
        url
      }
    }
  }
}
*/