enable JNews split post for all posts

add_filter( 'jeg_vp_metabox', 'override_split_post', 99, 3 );

function override_split_post( $meta, $post_id, $meta_keys ) {
    if ( 'jnews_post_split.enable_post_split' === $meta_keys ) {
        return '1';  /* enable split post for all posts */
    } elseif ( 'jnews_post_split.post_split.0.tag' === $meta_keys && 'h2' === $meta ) {
        return 'h2'; /* default Split Post by using this Tag options */
    } elseif ( 'jnews_post_split.post_split.0.template' === $meta_keys && '1' === $meta ) {
        return '1'; /* default Post Split Template */
    }
    return $meta;
}