drupal_admin_app-2.1.x-dev/drupal_admin_app.module

<?php
use Drupal\views\Views;
function drupal_admin_app_views_pre_render(&$view) {
   
  if( $view->id() == 'dn_app_people' && $view->current_display == 'rest_export_1'){
    
    $view1 = Views::getView('dn_app_people');
    $view1->get_total_rows = TRUE;
    $view1->execute('rest_export_1');
    $query = $view1->query->query();
    $rows = $query->countQuery()->execute()->fetchField();
    
    
    $view->field['nothing']->options['alter']['text'] = $rows;

  }

  if( $view->id() == 'dn_app_contents' && $view->current_display == 'rest_export_1'){
    
    $view1 = Views::getView('dn_app_contents');
    $view1->get_total_rows = TRUE;
    $view1->execute('rest_export_1');
    $query = $view1->query->query();
    $rows = $query->countQuery()->execute()->fetchField();
   
    
    $view->field['nothing']->options['alter']['text'] = $rows;

  }

}