Thanks for the tags feature!
I have an extension idea for this. NDEF fields allow saving extra data like URLs, phone numbers, text strings etc to NFC tags.
It would be great to use this extra data for automations. Like play a Youtube link saved on the tag in the media player. Then the data is universally readable also on the smartphones and other NFC music players. Then any NFC tag is readable without having to configure it first in HA.