How to format column aggregation totals?

thomas.wardin → made their first commit to this issue’s fork.

I am combining two webform submission fields into a text field like so:

{% if webform_submission_value_1 is empty %}
  {{ webform_submission_value_4 }}
{% else %}
  {{ webform_submission_value_1 }}
{% endif %}

In the webform, both fields are defined with an input mask like so:

'alias': 'currency', 'prefix': '', 'groupSeparator': '.', 'radixPoint': ',', 'digits': 2

I could not find a way to apply number_format to the views text field (which apparently isn't necessary), but the aggregation does not respect the format defined elsewhere;

ID	Betrag	Comment
50	1.200,00	Single Row
51	1.800,00	Single Row
	3000	Aggregate Row

How to fix?

Environment: Drupal 9.5.9, PHP 8.1.18, Views Aggregator Plus 2.0.2