You can use Authenticator Pro (android, opensesource) and Proton Pass, both let you copy the TOTP generation code to paste into another without problem. Both generate exact code
In fact that’s how I am using them right now, with Authenticator Pro is my on-device, offline, encrypted backup offline backup TOTP for Pass.
I guess it is not as straight forward as export import as you hope, but it’s not as bad as other options used to be.
Used it for awhile on and off.
You don’t need to use the encrypted sync service. You can have your desktop not sleeping and use the host-clients local sync method to be fully not relying on their external service.
Personally. I was using it with a Debian VM as the always-online host and other machines like phone and laptop, desktop as clients. While also have my own wireguard container running. Pretty much fully offline sync.
I stop using it when I realize they scraped the self-hosted server that they promised.
Also mobile client was ass, just like the promise of self-hosted server.
Ah. I used it for very long time btw. Just stop when I realize the dude scrapped the self-hosted server.
In the mean time. I have been using Notesnook but well, if they fucked up the self-hosted server, I’d leave too
There always markdown + syncthing that I can rely on as for note and to-do