"Write it using your favorite text-editor or IDE (we love VSCode)."

Which plugin do you use when editing an openAPI repo? For large project and multiple contributions, externalizing the markdown makes a lot of sense.
I'm currently using the OpenAPI (Swagger) Editor (42crunch.vscode-openapi) with the Redoc rendering setting. This crashes when adding references to external markdown files.

Do you have any preferred workflow and toolset that doesn't involve a lot of copy/pasting and commenting out the API definition while working with the openapi-repo structure?