How to handle routes with logic to different Clusters?

What is the best way to conditionally choose a different Cluster to proxy request to?

For example, ideally I'd like to have an application with 2 Clusters (`foo` and `bar`) and a route with `"clusterId": "foo"` and I want to, depending on some logic applied to an incoming request, use cluster `bar`. Is this possible?

I'm currently using the [Direct Forwarding](https://microsoft.github.io/reverse-proxy/articles/direct-forwarding.html) but that means I lose out on load balancing to Clusters. I can apply any logic I need and change path/destination but without load balancing etc. Is it possible to get access to something that handles this, similar to how `IHttpForwarder` is used? With this method it looks like I'd need to send the request to another load-balancer for `bar` and let that do the load balancing.

I had a look at `ITransformFactory` but that looks like it is transforming requests/responses to/from a specified Cluster, rather than changing the target cluster.

Is this possible?