transition part of particular template to another template

I want to take the result from detail.html to list.html 

in detail.html

{% with comments.count as count  %}

{{count}} Comment{{count|pluralize}}

{% endwith %}

in list.html 
I want to add the result of detail.html only I don't need to render all rest of html I just need this block. I can't use extend or include it because if I use it. it will render all template from the parent template 

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