How To Wrap Multiple Content Field Items In Li Tag
You can easily theme a multiple value field in the field template.

To do this put a field twig in mytheme/templates:

field--field-track-listing.html.twig

&lt;div{{ attributes }}&gt;

  &lt;div{{ title_attributes }}&gt;{{ label }}&lt;/div&gt;

  &lt;ol&gt;
  {% for item in items %}
    &lt;li&gt;{{ item.attributes }}&gt;{{ item.content }}&lt;/li&gt;
  {% endfor %}
  &lt;/ol&gt;

&lt;/div&gt;


Here you can change the html markup around each field item {{ item.content }} the same way as you do this in node around the complete field {{ content.field_name }}. This is the concept of nested render elements.