Right. So I also ordered the non-global version of the camera and this one does show up in Google Home. No answer on why the global version wouldn't, but problem fixed.
I've just received the IMI Home Security Camera 1080P Global and added it in my Mi Home app without problems. It works perfectly and pans as it should.
I already had a Roborock S5 vacuum robot, which also shows in Google Home because the accounts are connected:
So, all I should have to do...