Ruby on Rails equivalent to Django's SchemaGenerator

Question

I am currently looking into adding Swagger to an API that I work on. I found rswag, but from what I can tell, I would have to manually write specs for every endpoint in my API. This API has hundreds of endpoints, so this isn't very feasible.

Django REST Framework has SchemaGenerator which can generate an OpenAPI schema, either as a static file to commit and edit as you see fit or a dynamic endpoint which can be consumed by Swagger UI. Is there any equivalent for Ruby on Rails?

As a side note, I am also using jsonapi-resources. I'd be open to tools that are specific to JSON API.