HendrikRunte

// Variables used by Scriptable.
// These must be at the very top of the file. Do not edit.
// icon-color: orange; icon-glyph: sun;

///////////////////////////////////////////////////////////////////////
// dawn2dusk.js
// Origin:
// https://gist.github.com/HendrikRunte/4b5d03cb26e31508bc96553ad3c10f47
// Take it and have fun.
// Hendrik Runte, Nov 12, 2020, 17:33.

Sam-Jenkins

<?php
function addRssFeaturedImage() {
  global $post;
  if (has_post_thumbnail($post->ID)) {
    echo '<featured_image>' . wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'featured_size' )[0] . '</featured_image>';
  }
}
add_action('rss2_item', 'addRssFeaturedImage');