It can be used for some kind of surveillance, but the phones and internet-connected computers we are using are much more (and more effective) of a surveillance tool than the RFID chips in the North American and EUropean epassports.
Canada too is not all that sure that an "immunity passport" is a good idea:
https://www.politico.com/news/2021/0...ssports-474789 Canada's PM is reluctant about it. The US has this in a "do a feasibility study" -- something that at times can be used to pile up dirt for burying the idea.