Promise a nested block (under construction - I'm still working in the use case)

Try

{

  var(func: eq(Community.slug, "basb")) {
     community_uid AS uid
  }

  query(func: uid(community_uid)) {
    members: Community.members {
      uid
      communities: Member.communities @filter(not uid(community_uid)) {
        uid
      }
    }
  }
}