[N1QL RBAC] Neither all nor * works for granting bucket_admin to all buckets

Try the following query based on syntax from:
https://docs.google.com/document/d/1BSEdeCaY0t31LoPR-ebG7a2qodOL_M2MkKCmLyICkQM/edit

cbq> grant bucket_admin on ALL to johnDoe;
{
"requestID": "a2ac554f-01cd-4d90-a6ad-8f67cc1762ba",
"errors": [

{ "code": 3000, "msg": "syntax error - at ALL" }

],
"status": "fatal",
"metrics":

{ "elapsedTime": "384.395µs", "executionTime": "365.854µs", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}
cbq> grant bucket_admin on * to johnDoe;
{
"requestID": "981afc75-22aa-4ad0-8395-573f930780e1",
"errors": [

{ "code": 3000, "msg": "syntax error - at *" }

],
"status": "fatal",
"metrics":

{ "elapsedTime": "385.852µs", "executionTime": "359.362µs", "resultCount": 0, "resultSize": 0, "errorCount": 1 }

}

I see above errors.