I don't have a smart phone but I see there may be something similar for windows or for html. Maybe I will have to go with that. I need to get a smartphone but haven't had time to figure that out.
Understand though that 2FA means TWO FACTORS. that is two independent systems that to compromise the account BOTH need to be compromised simultaneously. Having your authenticator on the same computer you login would be like getting two locks for your front door and putting both keys side by side under the mat.
a) get google authenticator on a smartphone
b) get a yubikey
c) have your account compromised and lose potentially tens of thousands of dollars