Editing neo slot of "Las Meninas"

{
    "mainSubject": "sEpfwJLo9FKBGqn",
    "subjects": {
        "sEpfwJLo9FKBGqn": {
            "label": "Las Meninas",
            "schema": "Artwork",
            "statements": {
                "Year": {
                    "type": "number",
                    "value": 1656
                },
                "Medium": {
                    "type": "text",
                    "value": [
                        "Oil on canvas"
                    ]
                },
                "Creator": {
                    "type": "relation",
                    "value": [
                        {
                            "id": "rEpfwJLoNnEbFfz",
                            "target": "sEpfwJLo4ZAfkFw"
                        }
                    ]
                },
                "Located at": {
                    "type": "relation",
                    "value": [
                        {
                            "id": "rEpfwJLoPk5pFTM",
                            "target": "sEpfwJLnzqsDMs5"
                        }
                    ]
                },
                "Image": {
                    "type": "url",
                    "value": [
                        "https://upload.wikimedia.org/wikipedia/commons/3/31/Las_Meninas%2C_by_Diego_Vel%C3%A1zquez%2C_from_Prado_in_Google_Earth.jpg"
                    ]
                },
                "Estimated value": {
                    "type": "number",
                    "value": 300
                }
            }
        }
    }
}