php – How can I add an additional attribute to my email template?

A few years ago I was able to add our sku attribute to the email template here-

<?php $objectManager = MagentoFrameworkAppObjectManager::getInstance(); ?>
<?php $product = $objectManager->create('MagentoCatalogModelProduct')->load($_item- 
>getId()); ?>
<tr>
<td class="item-info<?php if ($block->getItemOptions()): ?> has-extra<?php endif; ?>">
    <p class="sku"><?= /* @escapeNotVerified */  __('SKU') ?>: <?= $block->escapeHtml($block->getSku($_item)) ?></p>
    <p class="product-name"><?= $block->escapeHtml($_item->getName()) ?></p>
    <?php if ($block->getItemOptions()): ?>
        <dl class="item-options">
        <?php foreach ($block->getItemOptions() as $option): ?>
            <dt><strong><em><?= /* @escapeNotVerified */  $option('label') ?></em></strong></dt>
            <dd>
                <?= /* @escapeNotVerified */  nl2br($option('value')) ?>
            </dd>
        <?php endforeach; ?>
        </dl>
    <?php endif; ?>
    <?php $addInfoBlock = $block->getProductAdditionalInformationBlock(); ?>
    <?php if ($addInfoBlock) :?>
        <?= $addInfoBlock->setItem($_item)->toHtml() ?>
    <?php endif; ?>
    <?= $block->escapeHtml($_item->getDescription()) ?>

I would like to add an additional attribute so I added this line-

<p class="sku"><?= /* @escapeNotVerified */  __('SKU') ?>: <?= $block->escapeHtml($block->getSku($_item)) ?></p>
<p class="product-name"><?= $block->escapeHtml($_item->getName()) ?></p>
<p class="product-name"><?= $block->escapeHtml($_item->getHorsepower()) ?></p>

I also tried-

: escapeHtml($block->getHorsepower($_item)) ?>

Neither of them worked. How can I add this attribute?