import json

# Образец JSON
data = {
    "movies": {
        "Al Pacino": {
            "1": {
                "id": "1",
                "name": "asd"
            }
        },
        "Robert De Niro": {
            "2": {
                "id": "1",
                "name": "zxc"
            }
        }
    }
}

# Словарь для JSON
actors = {'Al Pacino': {'id': 1, 'name': 'asd'}, 'Robert De Niro': {'id': 2, 'name': 'zxc'}}

result = {}
result['movies'] = []

for k, v in actors.items():
    result['movies'].append(k)

print(result)