function views1U_views_data_alter(array &$data)
{
    $data['node']['hello'] = array(
        'title' => t('Node Custom'),
        'field' => array(
            'title' => t('Node Custom'),
            'help' => t('My node custom'),
            'id' => 'hello',
        ),
    );
}

<?php

namespace Drupalviews1UPluginviewsfield;

use DrupalCoreFormFormStateInterface;
use DrupalnodeEntityNodeType;
use DrupalviewsPluginviewsfieldFieldPluginBase;
use DrupalviewsResultRow;

/**
 * Field handler to flag the node type.
 *
 * @ingroup views_field_handlers
 *
 * @ViewsField("hello")
 */
class NodeCustom extends FieldPluginBase
{
     ........
}