NServiceBus.AzureFunctions.AzureServiceBus and SendsAtomicWithReceive

Looking for some more color around the known limitation of lack of SendsAtomicWithReceive transport transaction mode support in NServiceBus.AzureFunctions.AzureServiceBus. Is this a limitation with how Azure Functions provide the necessary details to use the ViaEntityPath approach (though note it looks like somebody has figured that out), or is it just on the roadmap and not yet developed? Is this something the new isolated process model of Azure Functions on .NET 5.0 could help achieve?