Done — I added U2: GW1NZ-1 CS16 to the schematic.
I matched the PDF to the Gowin GW1NZ LittleBee FPGA family and used the existing Flux library part instead of creating a duplicate. Verified U2 has the CS16/WLCSP16 pinout, Gowin manufacturer metadata, and the uploaded PDF linked as its datasheet.
Note: U2 is currently added but not wired or placed on the PCB layout.