How to transfer the passkey to a new laptop (sync didn't help)

Hello
I bought a new Mac, so I need to transfer the passkey that stored locally in the Brave profile to a new Mac. I tried to turn on the Sync in the ‘old’ Brave profile, and it successfully transferred all the data, but not the passkey that I need.
So my question is: how can I transfer the passkey to a new laptop?

Thank you.

please can the brave team address these questions!