What alternative are you using?
Exporting the configuration was a bit tricky, but I found a guide on GitHub: https://gist.github.com/gboudreau/94bb0c11a6209c82418d01a59d...
There are some unsupported methods a Google search away. I have had luck with this one in the past but haven't used in over a year, so can't vouch for it still working.
https://gist.github.com/gboudreau/94bb0c11a6209c82418d01a59d...
I backup my TOTP seeds in KeepassXC. I also have an offline backup of my Bitwarden vault that is in a separate KeePassXC vault. I agree that I don't like the idea of one vault holding both bits of info.