Have you check with NMAC on how you can sell the car to another individual? In California, you can only buy the car from a Nissan dealer. You should check if another individual can buy the car directly from NMAC or a Nissan dealer on a car that is currently leased to you.
In January, I was trying to sell my 2017 Leaf SV to Carvana. Cavana was willing to pay $2700 over what I owe Nissan. I started the process with Carvana only to find out that Nissan had recently change the rule that only a Nissan dealer can purchase the car from NMAC. NMAC will no longer sell the car to an online third party dealer. So instead of making $2700 off the car, now I have to pay $400 disposition fee. I spoke to NMAC several times on the phone, it seems that they change the rule on November 2019 for California. The rule may be different for your state, you may want to check it out.
Have you check out swap a lease website? Nissan does allow someone else to take over your lease.