How to transfer Google Notes to a new Google Account
Unfortunately, Google doesn't offer an export or import function for this, but it is still possible:
Add the new account as an collaborator in the original account under the relevant note.
For the new account in the note settings, select the "Create a copy" function. This creates the copy of the Note in the new account.
Then remove the new collaborator in the shared note, this is possible in both the old and the new account.