Drury says nope.

what needs to be added?

Oh gee Rangers have cap issues going into this summer, Trading Chytil and Miller for Mitch Marner doesn't alleviate those cap issues either.

There is nothing you can add because neither Chytil or Miller are available for trade. The ONLY trade the Rangers make for Marner is a swap for Panarin, 1 for 1. Other than that, there is no trade to be made.

Well you’re removing our 2LD and what is likely our 2C moving forward. Those gaps will be impossible to fill taking on more cap than they can afford. So I guess we let Laf walk too. Sign a bunch of league min deals and hope that Marner can keep the puck in the offensive zone for 50 mins a game. The only Marner to NYR deal that can be done is where Panarin is going to TOR and then fill in the adds. Your proposal works for 1 team only and might not be possible even for the other side

Exactly this.
Flip Chytil and Trocheck, and add panarin and remove miller.

Marner for Trocheck and Panarin.