In this article, I'll show you how to add Twig Template Suggestions for views view field in drupal 8 with THEMENAME_theme_suggestions_views_view_field_alter():
<?php
/**
* @param array $suggestions
* @param array $variables
* @param $hook
*/
function THEMENAME_theme_suggestions_views_view_field_alter(array &$suggestions, array &$variables, $hook)
{
if ($variables['view']->id() && $variables['view']->current_display) {
$suggestions[] = $hook . '__' . $variables['view']->id() . '__' . $variables['view']->current_display . '__' . $variables['field']->field;
}
}