Integration Fields for Magento 2

UPDATE: this feature is now merged into the master branch, see release 1.3.0.

Here's a controller you could add to a custom extension and change per your liking;

<?php
/**
 * Copyright ©  All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Elgentos\PrismicIntegrationFields\Controller\Integration;

use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
use Magento\Catalog\Ui\DataProvider\Product\ProductCollectionFactory;
use Magento\Framework\App\Action\HttpGetActionInterface;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\Framework\Controller\ResultInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Serialize\Serializer\Json;

class Products implements HttpGetActionInterface
{
    /**
     * @var RequestInterface
     */
    public $request;
    /**
     * @var Json
     */
    public $json;
    /**
     * @var JsonFactory
     */
    protected $jsonFactory;
    /**
     * @var CollectionFactory
     */
    protected $productCollectionFactory;

    /**
     * Constructor
     *
     * @param RequestInterface $request
     * @param JsonFactory $jsonFactory
     * @param CollectionFactory $productCollectionFactory
     * @param Json $json
     */
    public function __construct(
        RequestInterface $request,
        JsonFactory $jsonFactory,
        CollectionFactory $productCollectionFactory,
        Json $json
    )
    {
        $this->productCollectionFactory = $productCollectionFactory;
        $this->jsonFactory = $jsonFactory;
        $this->request = $request;
        $this->json = $json;
    }

    /**
     * Execute view action
     *
     * @return ResultInterface
     */
    public function execute()
    {
        $productCollection = $this->productCollectionFactory
            ->create()
            ->addAttributeToFilter('status', ['eq' => 1])
            ->addAttributeToSelect([ // create a select option in adminhtml/system.xml for this
                'name',
                'description',
                'short_description',
                'image',
                'price',
                'url_key',
              ])
            ->addAttributeToSort('updated_at', 'DESC');

        $productCollection->setPageSize(50);
        $productCollection->setCurPage($this->request->getParam('page'));

        $results = array_values(array_map(function ($product) {
            return [
                'id' => $product->getId(),
                'title' => $product->getName(),
                'description' => $product->getShortDescription(),
                'image_url' => 'https://yourdomain.com/media/catalog/product' . $product->getImage(), // Use M2 helper to get full url dynamically
                'last_update' => date('U', strtotime($product->getUpdatedAt())),
                'blob' => $product->getData()
            ];
        }, $productCollection->getItems()));

        $jsonResult = $this->jsonFactory->create();
        $jsonResult->setData([
            'results_size' => $productCollection->getSize(),
            'results' => $results
        ]);

        return $jsonResult;
    }
}