Include Subtitle to Excerpt

/* Include Subtitle to Excerpt */
function add_subtitle_to_excerpt( $excerpt, $post_id, $excerpt_length, $excerpt_more ) {
    $subtitle = wp_kses( get_post_meta( $post_id, 'post_subtitle', true ), wp_kses_allowed_html() );
    if ( ! empty( $subtitle ) ) {
        $excerpt = $subtitle . ' ' . $excerpt;
    }
    $excerpt = wp_trim_words( $excerpt, $excerpt_length, $excerpt_more );
    $excerpt = preg_replace( '/\[[^\]]+\]/', '', $excerpt );

    return $excerpt;
}
add_filter( 'jnews_module_excerpt', 'add_subtitle_to_excerpt', null, 4 );