edit, found it in the code:
https://github.com/MinBZK/woo-besluit-broncode-digid-app/blo...
btw I see that attaching an nfc reader to your computer is also supported.
Theoretically supported, or actually possible?
As it stands, DigiD must be used with either the Android or the IOS app in the 'Substantieel' mode of authenticity verification when accessing health care records. This is likely to be pushed to other uses of DigiD as well eventually.
It does require a separate one-time activation of that specific ID card with the government (a physical letter gets mailed to your address with a code to activate that card on next login), but after that it's mostly painless.
If I'm gonna guess, it's intended for people that for whatever reason can't have a consistent DigiD app to login with (ie. Developer devices that are frequently reset over and over and would lose their regular login).
The passport feature is a new one to provide an alternative safer method of verifying ID for the times you need it. It isn't the default use of DigiD and is meant as an alternative to physically taking your passport places.
It is technically possible but apple makes it very difficult to get the entitlement. When a project I was working on tried to get it (to enable the use case of unmanned sports and library facilities unlocked by swiping the phone instead of a badge), they failed. Apple basically ghosted us. After a while they simply stopped responding to our questions. This is why we can’t have nice things on iphone.