I'm migrating Azure Functions v3 from Newtonsoft.Json to System.Text.Json and trying to get camelCase working globally.

For these:

• SignalR
• Service Bus output bindings
• Cosmos DB

I was able to explicitly pass JsonSerializerOptions or set it globally (SignalR) but I'm not able to do so for IAsyncCollector.

Here is my code:

[FunctionName(nameof(SampleFunction))]
public async Task Run(
    [ServiceBusTrigger(ServiceBusQueue.QueueA)] string json,
    [ServiceBus(ServiceBusQueue.QueueB)] IAsyncCollector<Delivery> queueB,
    [ServiceBus(ServiceBusQueue.QueueC)] IAsyncCollector<Driver> queueC,
    ExecutionContext context)
{
        // ... do some work

        await queueB.AddAsync(objectB).ConfigureAwait(false);

        // ... do some more work

        await queueC.AddAsync(objectC).ConfigureAwait(false);
}

objectB and objectC ends up in service bus not with camel case. As a workaround I'm setting property names as case insensitive on the receiving function.

PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
PropertyNameCaseInsensitive = true

Any idea how can I get IAsyncCollector to serialize with camel case?