How to get cart discount amount in minicart in Magento 2

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
  <type name="Magento\Checkout\CustomerData\Cart">
      <plugin name="interceptCustomerDataCart" type="Namespace\Modulename\Plugin\CustomerData\Cart"/>
  </type>
</config>

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
  <type name="Magento\Checkout\CustomerData\Cart">
      <plugin name="interceptCustomerDataCart" type="Namespace\Modulename\Plugin\CustomerData\Cart"/>
  </type>
</config>

<?php
 
namespace Namespace\Modulename\Plugin\CustomerData;
 
use Magento\Checkout\CustomerData\Cart as CustomerDataCart;
 
class Cart
{
   protected $checkoutSession;
   protected $cartTotalRepository;
public function __construct(
       \Magento\Checkout\Model\Session $checkoutSession,
       \Magento\Quote\Model\Cart\CartTotalRepository $cartTotalRepository,
   ) {
       $this->checkoutSession = $checkoutSession;
       $this->cartTotalRepository = $cartTotalRepository;    
   }
/**
    * @param \Magento\Checkout\CustomerData\Cart $subject
    * @param $data
    * @return array
    */
   public function aroundGetSectionData(CustomerDataCart $subject,\Closure $proceed)
   {
    $data = $proceed();
    $totals = $this->cartTotalRepository->get($this->checkoutSession->getQuote()->getId());
    
    $discountAmount = $totals->getDiscountAmount();
       $atts=[
        'cart_discount'=>$discountAmount,
       ];
       return array_merge($data, $atts);
   }
}