Anecdotally, I am used to seeing the prepared nutrition values for certain food types here in Norway (which is aligned with EU regulation through EEA). It is quite common, and not always acompanied by values for raw unprepared product.

Ive found mentions of it here: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A...

From Article 31: "Where appropriate, the information may relate to the food after preparation, provided that sufficiently detailed preparation instructions are given and the information relates to the food as prepared for consumption."