During an oil change at Nissan, they indicated on the printout that our 2010 Rogue S (front wheel drive) had a Transmission mount with a cracked bushing.
I took off the battery tray to try to see the crack but could not. How would one see a crack.like this to confirm the issue?

This is a pic of your entire mount set. Inspect the rubber at the indicated spots. The top one is the main hanger for the tranny, it needs to be inspected from underneath with the LHF wheel well liner partially pulled back. The one that goes most frequently is actually the one in the middle. That's the transmission torque mount located underneath at the seam between the tranny and engine.