With iOS 18.1, new hearing-aid features became available in those countries where authorities similar to the TGA in USA have already given approval.
NB: Intended for those 18+ with "mild to moderate" hearing loss
You can check if your country is listed for:
✽ Hearing Test feature
✽ Hearing Aid feature
✽ Hearing Protection feature (This feature is only available in USA and Canada)
See: AirPods Pro 2 - Hearing Health Feature Availability - Apple
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As well as iOS 18.1 version on the iPhone:
Seems the AirPods Pro 2 also need to have the latest firmware update.
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Apple Support' provides a YouTube video that explains how to use the new features, and also explains you can upload audiogram info. obtained from other sources.
https://www.youtube.com/watch?v=Q5noO6dnGBs
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Else: If you want to send feedback to Apple: Web-form: Feedback - AirPods - Apple