How to display gallery (WP) via ACF? Twig?

Question

Twig

Through the template I generate a product page.
I threw a standard WordPress gallery into ACF, screwed it up by creating a page and choosing a photo, it remains to draw a conclusion to the page.
I'm not very versed in twig, it's very annoying.

{% if galery is not empty %}
 <p>Idea</p>
  {{ wp.do_shortcode('[post_gallery]') }}
{% endif %}

I tried to do something like this through plagia - it didn’t work out.
And I don't understand how to get the default one.