Add an audio description with the audio player.

functions.php

add_filter('wp_audio_shortcode', function ($html, $atts, $audio, $post_id, $library) {
	$media_id = attachment_url_to_postid($atts['mp3']);
	if (0 !== $media_id) {
		$content = get_post_field('post_content', $media_id);
		$content = apply_filters('the_content', $content);

		if (!empty($content)) {
			$html = $html.'<div class="audio-description">'.$content.'</div>';
		}
	}

	return $html;
}, 10, 5);