Chabot is not looking very good this year. This is ominous for Ottawa since he is signed to a long and high-cap-hit contract. Werenski on the other hand is a stud and his long contract is attractive, not negative, because of it.
So, the answer is Columbus. Columbus says no. And Werenski probably doesn't want to go to Canada either, so he says no too.
This is a bad proposal, because it's likely one that is not made in good faith. The OP thinks Chabot is a struggling player he'd like to dump, as his posts about the player attest, and the OP also thinks that Werenski is great.