d = {"employees": [{"firstName": "John", "lastName": "Doe"},
                   {"firstName": "Anna", "lastName": "Smith"},
                   {"firstName": "Peter", "lastName": "Jones"}],
     "owners": [{"firstName": "Jack", "lastName": "Petter"},
                {"firstName": "Jessy", "lastName": "Petter"}]}

new = {"firstName": "Mat", "lastName": "Kuc"}

d['employees'].append(new)
print(d['employees'][3])
