let deviceData: [String: Any] = [
    ["timestamp": "2024-04-06T00:00:00Z", "temperature": 16],
    ["timestamp": "2024-04-06T01:00:00Z", "temperature": 15.5],
    ["timestamp": "2024-04-06T02:00:00Z", "temperature": 15],
    ["timestamp": "2024-04-06T23:00:00Z", "temperature": 15.5]
]
 
extension Portal {
 
  static let checkout = Self(
      name: "checkout",
      startDir: "portals/shopwebapp",
      initialContext: [
        // ...
        "deviceMetadata": JSONSerialization.data(withJsonObject: deviceData)
      ],
  )
 
}

import com.google.gson.Gson
import com.google.gson.reflect.TypeToken
 
data class DeviceData(
    val timestamp: String,
    val temperature: Double
)
 
val deviceData = listOf(
    DeviceData(timestamp = "2024-04-06T00:00:00Z", temperature = 16.0),
    DeviceData(timestamp = "2024-04-06T01:00:00Z", temperature = 15.5),
    DeviceData(timestamp = "2024-04-06T02:00:00Z", temperature = 15.0),
    DeviceData(timestamp = "2024-04-06T23:00:00Z", temperature = 15.5)
)
 
object Portal {
 
    val checkout = Portal(
        name = "checkout",
        startDir = "portals/shopwebapp",
        initialContext = mapOf(
            // ...
            "deviceMetadata" to Gson().toJson(deviceData)
        )
    )
 
}