Twig included template extending parent's block once

Question

Is there a way to do this? I have a template which outputs one blog article.

Now, on index page I show 10 articles by including that template in

Answer 1

You can use a new block (not tested):

{# index.html.twig #}
{% block stylesheets -%}
    {% block article_styles '' %}
{%- endblock %}

{% for ... -%}
    {% include VendorBundle:template.html.twig with {'article': article} %}
{%- endfor %}

{# template.html.twig #}
{% block article_styles -%}
    {{ parent() }}
    
{%- endblock %}

{# ... #}

Edit: Added {{ parent() }}, this will print every content the block already has.