Add Featured Image to RSS Feed Description and Create separate image Node in Wordpress,

functions.php

<?php
    // Add the image and thumbnail node to RSS feed
    function add_rss_node_image_thumbnail() {
        global $post;
        if (has_post_thumbnail($post->ID)):
            echo "<image>" . get_the_post_thumbnail_url($post->ID, 'medium') . "</image>\n";
        endif;
    }
    add_action('rss2_item', 'add_rss_node_image_thumbnail');

    function add_rss_image_thumbnail($content) {
        global $post;
        if ( has_post_thumbnail( $post->ID ) ){
            $content = '<div>' . get_the_post_thumbnail( $post->ID, 'large' ) . '</div>' . $content;
        }
        return $content;
    }

    add_filter('the_excerpt_rss', 'add_rss_image_thumbnail');
    add_filter('the_content_feed', 'add_rss_image_thumbnail');