Hi @rhabbachi,
The docs are a bit confusing here, we’ll clean them up. Basically what you’re looking for here isn’t possible today. The docs are talking about the ability to use output variables in a nested block, but there aren’t any nested blocks available for docker. The reason the docs say this is that they’re autogenerated and don’t clarify the context properly. Sorry about that.
At present, we don’t support getting data between applications in this way, mostly because we expected users to be feeding configuration into the waypoint config rather than threading values between applications.