Using variable assignment with QueryBuilder

[Rurik Thomas Greenall]

Is there any way to do BIND assignments with QueryBuilder
(ConstructBuilder)?

I'm attempting to return plain string literals from

PREFIX dcterms: <http://purl.org/dc/terms/>
PREFIX ex: <http://example.com/onto/>

CONSTRUCT {?url dcterms:date ?date }
WHERE {
  ?url dcterms:date ?d
  BIND (str(?d) as ?date)
}

Regards,

Rurik.