Yes, other providers could theoretically import Bitwarden’s proprietary format. Bitwarden’s reference to a future release is regarding the standardized import/export of passkeys that is in development: https://fidoalliance.org/fido-alliance-publishes-new-specifi...
I work at bitwarden and I can confirm this. While technically you have the data, any other app need to support our json format (which they totally can, our code is open source) - but CXP (the standard) is happening this year so we’re planning on using it.