Add custom field to generated OpenAPI spec from middleware?

[Jtcruthers]

I have a role-based access control middleware that I add to operations. Technically, it's a function I pass a list of roles to that returns a middleware that checks the context for one of the required roles, and returns a 403 if it doesn't exist, otherwise call next.

I would like to add a field to the OpenAPI spec stating what roles are required for each endpoint. Is there a way to add it from that middleware? If not, is there a way to add that to the spec manually for each operation? I can't figure out how to do either