Why does email alert gives me empty items?

Hi, Why does my items and its qty won’t appear on the email?
I’ve tried @max_morais_dmm code.
Here it is:

< ul>
{% for item in doc.items %}
< li>{{ item.item}}< /li>
{% endfor %}
< /ul>

btw. my item’s field is a data type field and its field name is “item”

Should be

{{ item.item_code }}

Oh thank you. @rmehta!