Magento2 CMS Block – Get Product Details Using Product ID or SKU

Out of the box you cannot retrieve the block title.

What you'll have to do is:

First, create your own block class that extends Magento\Cms\Block\Block

Optional: if you want the getTitle method to be available for every static block you can setup a preference by creating a etc/di.xml with the following content:

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
    <preference for="Magento\Cms\Block\Block" type="Vendor\Module\Block\Cms\Block" />
</config>

Then, change your code with the following:

$myCmsBlock = $block->getLayout()->createBlock('Vendor\Module\Block\Cms\Block')->setBlockId('footer_impressum');
$blockTitle = $myCmsBlock->getTitle();
echo $myCmsBlock->toHtml();?>

Where Vendor\Module\Block\Cms\Block is the class you have created to rewrite the original class.

Then create your Vendor\Module\Block\Cms\Block class with the following content:

<?php

namespace Vendor\Module\Block\Cms;

class Block extends \Magento\Cms\Block\Block
{

    protected $_blockRepository;

    public function __construct(
        \Magento\Framework\View\Element\Context $context,
        \Magento\Cms\Model\Template\FilterProvider $filterProvider,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Cms\Model\BlockFactory $blockFactory,
        \Magento\Cms\Api\BlockRepositoryInterface $blockRepository,
        array $data = []
    ) {
        parent::__construct($context, $filterProvider, $storeManager, $blockFactory, $data);
        $this->_blockRepository = $blockRepository;
    }

    public function getTitle()
    {
         $blockId = $this->getBlockId();
         $title = "";
         if ($blockId) {
             $block = $this->_blockRepository->getById($blockId);
             $title = $block->getTitle();
         }
         return $title;
    }
}

You need to create folder in root of your system and create one php file inside those folder,

Keep below content in your file and run from browser,

<?php
// MAGENTO START
include('app/bootstrap.php');
use Magento\Framework\App\Bootstrap;
$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();

$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');

$productCollectionFactory = $objectManager->get('\Magento\Catalog\Model\ResourceModel\Product\CollectionFactory');
$collection = $productCollectionFactory->create();
$collection->addAttributeToFilter('sku', '24-MB01');
$collection->addAttributeToSelect('*');
foreach ($collection as $product) 
{
    $product->setData('short_description', 'test description');
    $product->save();
    echo "Product Updated". " ";
}