Obtain group membership roles for a user across multiple group hubs?

Does any know how best to retrieve the group membership roles for a user across multiple group hubs without making a dozen or more separate API calls?

I am able to confirm membership when querying for a single group hub just fine using the roles collection.

QUERY:
SELECT id FROM roles WHERE users.id = '46' AND node.id = 'grouphub:archer-staging'

RESULT:
{
  "status" : "success",
  "message" : "",
  "http_code" : 200,
  "data" : {
    "type" : "roles",
    "list_item_type" : "role",
    "size" : 1,
    "items" : [ {
      "type" : "role",
      "id" : "g:archer-staging:Owner"
    } ]
  },
  "metadata" : { }
}

However,  despite the developer docs stating that the IN operator is supported for the node.id constraint, when I give it a try I only ever get back the top-level (i.e. community-level) roles and never the membership roles, even if I try passing only one node ID within the IN operator, as shown below.

QUERY:
SELECT id FROM roles WHERE users.id = '46' AND node.id IN('grouphub:archer-staging')

RESPONSE:
{
  "status" : "success",
  "message" : "",
  "http_code" : 200,
  "data" : {
    "type" : "roles",
    "list_item_type" : "role",
    "size" : 2,
    "items" : [ {
      "type" : "role",
      "id" : "t:Administrator"
    }, {
      "type" : "role",
      "id" : "t:Employee"
    } ]
  },
  "metadata" : { }
}

I suppose I could use a custom endpoint but it still feels like there has to be a better way than performing nearly a dozen (or more) separate queries to check for membership across some group hubs.

Anyone ever had to do something like this who has a nifty magic trick they can share? Thanks!!

EDIT:  I just stumbled upon the LiQL improvements in the upcoming 20.11 release which will definitely be awesome. But if anyone still has any thoughts of what can be done until that release becomes generally available I’d really appreciate it.