I don’t think so. You need to input the nsec you want to sign things with there. It’s stored encrypted by a password in the browser.
Discussion
# Example Oauth-like flow to create a new user account with Nsecbunker
Coming soon...😅
https://nips.nostr.com/46#example-oauth-like-flow-to-create-a-new-user-account-with-nsecbunker