Use normal TFT Shield with SD as a Nextion Display
No, you can't.
Nextion displays contain their own microcontroller with their own closed-source firmware on them.  You need that firmware to have a clue what is in Nextion files, and only Nextion have that firmware.
While it may be possible to reverse engineer Nextion display data and write your own software to interpret it, it would be a huge job with little to no real-world benefit.