Nextjs Pages Router & @supabase/ssr: how to get session in middleware

We're on Nextjs Pages Router but recently upgraded from auth-helpers to @supabase/ssr. We don't seem to be able to get the user session in middleware anymore and the docs don't show which client to use in middleware: https://supabase.com/docs/guides/auth/server-side/nextjs?queryGroups=router&router=pages

Is it not possible at all? Should we protect pages on each pages level instead?