field--field-images.html.twig

{# 
   This is a glue template.  It maps Drupal data to a simpler structure.
   In this case, it converts the items render array into an array 
   of rendered images, then passes that into the image-grid component.
   It also handles outputting the wrapper with the attributes Drupal
   requires.
#}
{% set images = [] %}
{% for item in items %}
  {% set images = images|merge([item|render]) %}
{% endfor %}
<div{{attributes}}>
  {% include 'components/image-grid.html.twig' with {
    images: images
  } only %}
</div>