use the original description without stripping away all the line breaks and paragraph tags from the description field.

use_original_description.php

// use the original description without stripping away all the line breaks and paragraph tags from the description field.
function use_original_description( $data, $feed_id, $product_id ) {
   
   // Only use the original description in the feed with the given ID (in this case 2)
   // remove if you want this for all feeds.
   if($feed_id == 2 ){

      // Get the product.
      $wc_product = wc_get_product( $product_id );

      // Store the original description in the feed description element.
      $data['description'] = $wc_product->get_description();

   } //END IF

   // Always return data!
   return $data;
}

add_filter( 'wppfm_feed_item_value', 'use_original_description', 10, 3 );