Photos smart album for photos with no people at all

The macOS Photos app allows searching for photos that contain specific people. But how can one create a smart album that only contains photos that do not contain any people at all?

It is possible to create a filter that excludes a specific person. That filter might be a solution if there only was a way to exclude all persons using a wildcard or similar.

The smart albums use SQL at the core so you may use % as a wildcard.

Person is not %

If you create a smart album with the above, it will populate full of photos where the facial recognition did not match a photo. However, people with a detected face that has not yet been named will also show up in the album.