The iOS "passwords" app didn't support exporting for a while, though they eventually added it.
Usually when this type of thing happens, all the major players decide to do it at the same time.
- Authy
- Google Authenticator
Notably not password managers.
Google Authenticator has an export-as-QR-code function that several other authenticator apps can parse. Is it the best/most convenient implementation? Obviously not, but you can absolutely export the codes.
Not password managers of course, but thanks for reminding me that I should figure out how to ditch Authy.