OAS 3.0.3 request schema for an empty JSON body

I am attempting to create an OAS schema for an empty JSON body:

{ }

I am trying to get the documentation to show an empty JSON body, and have that autogenerated.

The API defines this as a POST (yes, it ought to be a GET, the design of the API is in some respects sub-optimal) request, and expects the open/close bracket, and nothing else. I've tried

  …
  content:
    application/json: { }
  …

but that doesn't work (it just shows nothing in the request body), and everything else I've tried is invalid. Would appreciate any assistance on this. I have not been able to find any examples or even similar questions (maybe I’m looking in the wrong place?).

Any assistance would be greatly appreciated!