Derived field for loki not added

Hello all, I am adding loki and tempo as default datasources for grafana. Added derived fields also for loki. Datasources are added but derived fields are not updated on Grafana. Please help me to if this configuration is incorrect:

 chart_specs = [
            {
                "name": "grafana",
                "chart": {
                    "git": "https://github.com/grafana/helm-charts",
                    "path": "charts/grafana",
                    "ref": "bd62f15e63f3e78aa9514d420bc028db9b5f47f0"
                },
                "values": {

                    "datasources": {
                        "datasources.yaml": {
                            "datasources": [
                                {
                                    "name": "Tempo",
                                    "type": "tempo",
                                    "access": "proxy",
                                    "orgId": 1,
                                    "url": "http://tempo:3100",
                                    "basicAuth": False,
                                    "isDefault": False,
                                    "version": 1,
                                    "editable": True,
                                    "apiVersion": 1,
                                    "uid": "tempo"
                                },
                                {
                                    "name": "Loki",
                                    "type": "loki",
                                    "access": "proxy",
                                    "orgId": 1,
                                    "url": "http://loki:3100",
                                    "basicAuth": False,
                                    "isDefault": True,
                                    "version": 1,
                                    "editable": True,
                                    "apiVersion": 1,
                                    "jsonData": {
                                        "derivedFields": [
                                            {
                                                "datasourceUid": "tempo",
                                                "matcherRegex":  "\"traceId\":\"(\\w+)\""
                                                "name": "TraceId",
                                                "url": "$${__value.raw}"
                                            }
                                        ]
                                    }
                                }
                            ]
                        }
                    }
                }              
            },