Umm, why not?

First, you can use a different app (like aegis) to generate OTPs.

Second, pass has an extension (https://github.com/tadfisher/pass-otp) that can be used to generate OTPs.

Third, you can use something like oathtool to generate your otp using your totp secret

oathtool -b --totp "your-totp-secret"