OpenAPI spec generation with Phoenix Router forward - routes missing

[Ven109]

Using Paths.from_router() doesn't include routes from sub-routers mounted with forward. Only direct routes are extracted.

Setup

# router.ex

forward "/api/phoenix/v1", MyApp.V1Router
forward "/api/phoenix/public/v1", MyApp.PublicV1Router

# api_spec.ex
paths: Router |> Paths.from_router() |> # filters...

Problem

Sub-router routes aren't included in the generated spec.

Questions

Built-in way to handle forwarded routes in open_api_spex?
Recommended approach for this use case?
Working examples?

Any help appreciated!