Hi @gennarodp,
Based on the issue that you mentioned, do you want to display NFC value in a Label?
Could you please share a bit more about your scenario?
Actually, the ReadNFC() returns a record containing the following field:

ReadNFC is only supported when running the app in a native mobile player such as the iOS and Andriod players. Even with a supported player, a device may not support NFC, in which case a message will be shown to the user and the function will return a blank record.
Please note that Text and URI datatypes are supported.
Add a Label and set the Text property as below:
With( ReadNFC(),
If( Not IsBlank( Text ),
"Read Text: " & Text,
Not IsBlank( URI ),
"Read URI: " & URI ,
"Didn't read Text or URI"
)
)