Somebody on this forum from the same country as you 
has also expressed privacy concerns about the BeUno app.
I don’t know if it’s possible to scan the implant outside their app.
I tried several NFC tools, like TagInfo for instance, but none of the returned fields contained anything close to the measured temperature.
Note it also works as a NDEF storage, allowing the user to store medical information, emergency contacts, information about the user, link to websites or other free text. And also store a COVID certificate (under the text format “HC1:…”)