Magento 2: How to add custom text attribute on product page after price, Only if special price?

Question

How to add custom text attribute on the product page after price Only if special price. If special price custom text is visible if normal price custom text is not visible. Magento 2.3.6

For example: Product 1 with special price, text "custom text aaa" visible. If product with regular price only, the text not visible.

Product 2 with special price, text "custom text bbb" visible. If product with regular price only, the text not visible.

Answer 1

app/code/YourVendor/YourModule/etc/di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
   <type name="Magento\Catalog\Block\Product\View\Details">
       <plugin name="YourVendor_YourModule::add_custom_text" type="YourVendor\YourModule\Plugin\ProductViewDetailsPlugin" />
   </type>
</config>

app/code/YourVendor/YourModule/Plugin/ProductViewDetailsPlugin.php

<?php
namespace YourVendor\YourModule\Plugin;

use Magento\Catalog\Block\Product\View\Details as ProductViewDetails;
use Magento\Framework\Pricing\Render as PricingRender;

class ProductViewDetailsPlugin
{
    public function afterToHtml(ProductViewDetails $subject, $result)
    {
        $specialPrice = $subject->getProduct()->getSpecialPrice();
        if ($specialPrice !== null) {
            $customText = 'Your custom text goes here.';
            $priceRender = $subject->getLayout()->getBlock('product.price.render.default');
            if ($priceRender instanceof PricingRender) {
                $result .= '<div class="custom-text">' . $customText . '</div>';
            }
        }
        return $result;
    }
}