Editing neo slot of "The Milkmaid"

{
    "mainSubject": "sEpfwJLo8KqKsUP",
    "subjects": {
        "sEpfwJLo8KqKsUP": {
            "label": "The Milkmaid",
            "schema": "Artwork",
            "statements": {
                "Year": {
                    "type": "number",
                    "value": 1658
                },
                "Medium": {
                    "type": "text",
                    "value": [
                        "Oil on canvas"
                    ]
                },
                "Creator": {
                    "type": "relation",
                    "value": [
                        {
                            "id": "rEpfwJLoLsv7dAs",
                            "target": "sEpfwJLo3dEPj2Z"
                        }
                    ]
                },
                "Located at": {
                    "type": "relation",
                    "value": [
                        {
                            "id": "rEpfwJLoMpL8EVs",
                            "target": "sEpfwJLnxyQy6vR"
                        }
                    ]
                },
                "Image": {
                    "type": "url",
                    "value": [
                        "https://upload.wikimedia.org/wikipedia/commons/2/20/Johannes_Vermeer_-_Het_melkmeisje_-_Google_Art_Project.jpg"
                    ]
                },
                "Estimated value": {
                    "type": "number",
                    "value": 150
                }
            }
        }
    }
}