Update all users with a new rule?

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This is how it appears when I request a list of users from the api.

{
    "created_at": "create date",
    "dateofbirth": "some birthdate",
    "family_name": "Last name",
    "given_name": "First name",
    "identities": [
        {
            "provider": "oauth2",
            "access_token": "some token",
            "user_id": "some user id",
            "connection": "connection name",
            "isSocial": true
        }
    ],
    "name": "Full name",
    "nickname": "Full name",
    "picture": "url to picture",
    "ssn": "I want to copy this field",
    "sub": "some id",
    "updated_at": "update date",
    "user_id": "user id",
    "last_login": "login date",
    "last_ip": "login ip",
    "logins_count": 1,
    "app_metadata": {
        "userId": "internal user id",
        "roles": [
            "internal user role"
        ]
    }
}

So my goal is to copy the ‘ssn’ field over to the ‘app_metadata’ field to make it searchable for all the existing and future users.