{
    "sendMeEmails": { "one_of": [0, 1] },
    "users": "required",
    "zipCode": "required",

    "required_if_1": {"required_if": {"sendMeEmails": 1 } },
    "required_if_2": {"required_if": {"users/3/address/city": "Kyiv"}},
    "required_if_3": {"required_if": {"zipCode": "01246"}}
}