Azure Durable Function - load balance Activity Functions over multiple Function apps?

Question

I've tried to build a solution in which I have multiple Function Apps deployed (in multiple Azure Regions) which all share the same Task Hub (set via host.json) storage account. Now my idea was that since each of them should listen to new work for the Activity Functions, the load should get somewhat distributed. But thats not happening - at least with what I have tried so far. It looks like the Function App for the Activity Functions is already determined by which Orchestrator is picked. (I had to deploy the Orchestrator in together with the Activity Functions or else it wouldn't even kick off).

So my question is: Would such a scenario be possible to achieve using Durable Functions?

host.json

{
  "version": "2.0",
  "extensions": {
    "durableTask": {
      "hubName": "MyTaskHub",
      "storageProvider": {
        "connectionStringName": "DurableStorage",
        "useAppLease":  false
      }
    }
  }
}