It's an NFC card that can be read with any NFC card reader, USB or smartphone based.

https://www.ausweisapp.bund.de/en/open-source I just saw that it's available in alpine.

So I tried installing it on my postmarketOS smartphone and it runs out of the box: https://i.imgur.com/nRIAyrq.png

My Shift6mq is listed has not having NFC support in postmarketOS, so I can't actually test it, but I assume the USB card reader option will work once it's supported.