Azure Functions Trigger with custom type

functions-trigger.cs

[FunctionName("Function1")]
public static void Run([CosmosDBTrigger(
    databaseName: "test",
    containerName: "items",
    LeaseContainerPrefix = "test",
    Connection = "cosmosDB")]
    IReadOnlyList<MyPOCOWithSystemTextJson> input, ILogger log)
{
    //...
}

public class MyPOCOWithSystemTextJson
    {
        [JsonPropertyName("id")]
        public string Id { get; set; }
    }
}