Hi nickdeclippel
welcome to the Apple (user-to-user) Community!
Re: How to enable Hearing Aid functions on AirPods Pro 2?
If needed: check AirPods Pro 2 have the latest firmware : About firmware updates for AirPods - Apple Support
Apple support have a video online that may or may not help in your case:
https://www.youtube.com/watch?v=Q5noO6dnGBs
Apple Support also provides articles on the new features:
Take a Hearing Test with AirPods Pro 2 - Apple Support
Use the Hearing Aid feature on your AirPods Pro 2 - Apple Support
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Re: I bought Airpods pro 2 in Belgium. So no Hearing Health of Hearing Aid functions.
Will upgrading my IOS in the Netherlands solve my problem (in the Netherlands these functions are available)?
Am no expert in this area, so can not say for sure: If you do not receive the answer you ask for in your discussion thread here, you can always check with the experts at AirPods Support (online chat / phone / email): ie: There is a "Get Support - start now" contact link (scroll right down) at the bottom of their website:
AirPods Support - Official Apple Support
All the best :-)