Managed Federation with Gateway Subgraph

We want to have a federated graphQL implementation that at the start will only have one subgraph. In order to get this working, we’ll need the gateway to have it’s own subgraph at the beginning. This doesn’t seem possible with managed federation (we don’t want to start out with serviceList). Has anyone run into this or found a workaround?

Hi, any success with this? We are trying the same approach