Importing passwords only imports them into string fields. The login mechanism won’t recognize them as passwords, only as strings. This is fine for a user who has implemented their own login mechanism - which is not recommended at all. But if the Wix login system is being used, then a user (and their credentials) have to be created - and verified - “using the sytem”.
I could actually see some sort of procedure whereby a site owner/admin imports a list of users with at least an email field. The import would automatically trigger a verification email to be sent to the user, who would then have to click a link/button/something to verify their email, and would then be prompted to enter a password.
Seems to me that this is a feature that could be added to the Wix Users product. I would suggest requesting this as a new feature on the Wishlist Page - the official platform for requesting new features.