Is there a "platform authenticator" that allows import/export of the actual origin site, keypair, and credential id in plaintext? The next would be a variety of platform authenticators able to import and use those?

I don't want vendor lockin and I don't want proprietary third party cloud based backup/recovery.

Today with totp, I store the plaintext otpauth url and I can use oathtool to spit out codes when needed on my desktop. My phone has aegis, but I don't use any cloud based backup/recovery. I switched from Google Authenticator after they implemented their cloud based syncing to google.