Is it possible to query relationships via [ReadRelationshipsRequest ](https://buf.build/authzed/api/docs/main:authzed.api.v1#authzed.api.v1.ReadRelationshipsRequest) like below

SQL
select * from relation_tuple where namespace='page' and userset_namespace='usergroup' and relation='viewer' and userset_relation='member' and userset_object_id in ('1', '2');

 namespace | object_id | relation | userset_namespace | userset_object_id | userset_relation 
-----------+-----------+----------+-------------------+-------------------+------------------
 page      | 1         | viewer   | usergroup         | 2                 | member
 page      | 2         | viewer   | usergroup         | 2                 | member
 page      | 3         | viewer   | usergroup         | 2                 | member
 page      | 4         | viewer   | usergroup         | 2                 | member
(4 rows)

WIth the above, I can make a

HashMap<GroupID, Vec<Page>>

. This is useful in answering N+ 1 querying like

JSON
// fetch a list of groups and also the pages each group has access to
groups {
  pages {
    name
  }
}