There was a thread on the subject a couple years or so back and this was the posted response when reaching out to support:
Thank you very much for reaching out.
Really hoping that doesn’t happen anytime soon. I would recommend always having some sort of emergency contact and having a plan in place if need be.
They could reach out to us and verify their ownership of the site though, and you could always create say a site in your Webflow account with listed emergency contacts which we could reference.
Please let me know if this is helpful, or if you have any additional questions, I’m happy to help further.
Kind regards,
Waldo
It would be great if this was somewhere else in the help documentation (or within the account dashboard), but that should give you a good place to start.
Maybe @Waldo can chime in and confirm/update the protocol.