Can a Jinja variable’s scope extend beyond in an inner block?

One way around this limitation is to enable the “do” expression-statement extension and use an array instead of boolean:

{% set exists = [] %}
{% for i in range(5) %}
      {% if True %}
          {% do exists.append(1) %}
      {% endif %}
{% endfor %}
{% if exists %}
    <!-- exists is true -->
{% endif %}

To enable Jinja’s “do” expression-statement extension: e = jinja2.Environment(extensions=["jinja2.ext.do",])