Ability to provide additional documentation for operations endpoint

When enabling/implementing operations as described in https://www.jsonapi.net/usage/writing/bulk-batch-operations.html i.e with a OperationsController class, the generated openapi documentation provides some general information. As far as I've been able to figure out it's not possible to customize / add to the generated documentation. Rationale is that there can be some system / data model specific rules that apply that is important for a third party to know.