render review berore post content

add_action(
    'init',
    function () {
        if ( ! is_admin() && class_exists( 'JNews_Review_Frontend' ) ) {
            remove_filter( 'the_content', array( JNews_Review_Frontend::getInstance(), 'review_content' ), 10 );
        }
    }
);
add_filter( 'the_content', 'add_review_before_post' );

function add_review_before_post( $content ) {
    if ( class_exists( 'JNews_Review_Frontend' ) && jnews_get_metabox_value( 'jnews_review.enable_review', false ) ) {
        // if split post, we need to leave the post to it should be
        $split_post = jnews_get_metabox_value( 'jnews_post_split.enable_post_split', false );

        if ( $split_post ) {
            return $content;
        }

        // check multipage
        global $page, $numpages, $multipage;

        if ( $multipage ) {
            if ( $page === $numpages ) {
                return JNews_Review_Frontend::getInstance()->post_review() . $content;
            }
        } else {
            return JNews_Review_Frontend::getInstance()->post_review() . $content;
        }
    }

    return $content;
}