NF plan can be acquired if one subscribes to the 1499 plan and not 999 plan so you are paying 500 for NF plan and additional 300/- for UHD NF plan (according to this screenshot ) which totals to 800/- a month
EDIT - It's the same as buying individual NF plan for 800 and 1499 Jio plan is basically the mobile+ NF plan 349 plan.