It is my understanding that there is ongoing work to create an import/export standard, and that bitwarden is planning to support it. But also, you can give your heirs your bitwarden root password.
I have heard this so many times that, given the big names behind the standard who benefit from vendor lock-in, it’s no wonder they are dragging their feet. Until there is a serious import/export mechanism, I’ll stay away.
If you die or become incapacitated, your emergency contact can click a button to request access to your vault. You receive a series of emails requesting that you approve or deny their request.
If you don't deny their request within a wait time that you specify in advance, your public key-encrypted user symmetric key is delivered to the the emergency contact for decryption with the their private key.
More here -> https://bitwarden.com/help/emergency-access/
I expect something akin to handing out the private key to your heirs is what happens. But the term "giving out" understates what happens: https://bitwarden.com/help/emergency-access/ It's an escrowed time lock. I haven't looked at the details, but I expect it's a multi step protocol involving at least two public keys. It the scheme of possibilities, it's pretty good.