How do I document path parameters that appear in url_prefix in a Blueprint? Example:

blueprint = Blueprint(
    'Media',
    __name__,
    url_prefix='/brands/<int:brand_id>/media',
)

@blueprint.route(...)
...

I've read through marshmallow-code/flask-smorest#23 but it only seems to apply to @blueprint.route(), not Blueprint().

I've recently stumbled upon a good project called docsify. I think we can use it to generate documents. Read the Docs is also one of the options available.