Yes. There is evidence that Vattel's work was "celebrated" as "genius" nearly a quarter of a century prior to the penning of the Constitution.
The framers thought it an important enough legal treatise that they openly read and referenced his work during the Constitutional Convention itself.
They did. They drew from the best to form a more “perfect union”. The Founding Fathers were brilliant. To meet them and pick their brain............ Not only brilliant, but courageous. Their heads were on the line, literally.