Additional texts: add conditions

While I found a solution, it is not a visibility condition, but rather a full Twig field for the text that supports the {% if bla %}{% endif %} syntax.

More complex example:

{% set i = 0 %}
{%- for e in elements|keys -%}
  {%- set i = i + 1 -%}
  Field {{ i }}: {{ e }} = “{{ webform_token('[webform_submission:values:' ~ e ~ ']', webform_submission) }}”äö
{% endfor -%}