I have a shopify plus and the read_users permisisons. Via graphql I'm able to retrieve a bunch of data from my staff member like name and such. Unfortunately, I can't find a way to fetch the user role the staff member is assigned to. Another problem I have is that I'm not able to query the staff member list, every field I try, I get an error saying that "query" is not recognized. So my questions are: how can I get the user role of the staff member or, at least, the list of the user roles created in the admin? how can I query/filter the staff member list (other than first, last, etc)?