mytheme.theme

function mytheme_preprocess_user(&$variables) {

    if($variables['elements']['#view_mode'] == 'full') {
        /** @var $target_user \Drupal\user\Entity\User */
        $target_user = $variables['user'];
        
        $supported_projects_by_user_view = \Drupal\views\Views::getView('supported_projects_by_enlightaid_user');
        $supported_projects_by_user_view->get_total_rows = TRUE;
        $supported_projects_by_user_view->execute('supported_projects_by_user_block');

        $variables['projects_supported'] = $supported_projects_by_user_view->render();
        $variables['num_projects_supported'] = $supported_projects_by_user_view->total_rows;
        /**
         * Now in user--full.html.twig
         * {{projects_supported}} renders the view
         * {{num_projects_supported}} is the total result of view
        */
    }
}