Make requests to Dark handlers within Dark? (beyond HttpClient)

[StachuDotNet]

Once I've created a Dark handler, I'd like to start making calls to it quickly, without leaving Dark.

When editing a handler, I imagine some UI available that will open up a form where I can input any path params, query params, request body, etc. - effectively, similar UI to a tool such as Postman.

[StachuDotNet]

An adjacent idea for how the UI could be used more broadly:
Let's say a user defines a handler GET /test, and needs to call that handler from somewhere else in the canvas, or in another canvas they have access to. Rather than manually write an HttpClient call, perhaps they could fill in such a form and have some sort of visual 'reference' there? (very hand-wavey - needs more thought)