Dynamic Foldername in HTML Output

[Eugen Ledergerber]

I would like to save all daily files that are prepared in JSON format in the HTML root in a folder that corresponds to the year of the daily file. Example:
HTML_ROOT
  2025
    day_20251212.json
    day_20251213.json
    ...
 2026
   day_20260101.json
   ...
Ich habe versucht, im skin.conf mit den Platzhaltern zu arbeiten, die für den Dateinamen funktionieren:
template = YYYY/day_detail_YYYYMMDD.json.tmpl

Unfortunately, I cannot find any information on how to achieve this or whether it is even possible.

Thank you very much for your help.