Nozzles are one thing, the engine itself another. There is no problem to shape the nozzels of the current 117 like that and it even has 2D TVC, but the NG engine will come only in later stages and that's why India delayed FGFA induction too, because IAF was not ready to take a half ready 5th gen fighter. Not to mention that more important than the nozzles are the coverings of the engines, which currently are not shapped and if it finally included radar blockers, or another feature to hide the engine compressors.