The TFT board shown on ebay is a shield. You cant use the Port option in case you want to plug that on top of a Nucleo F446 because all the port pins need to match the LCD_D0..LCD_D7 pins. You should use the BUS_8 protocol option instead. Comparing the TFT board layout and the F446 layout it seems the mapping should be:

Alternatively you could use the pin mapping proposed above by Zoltan , but then you need to wire all pins separately.

Note that the TFT board seems to have bus buffers installed to convert the 5V arduino levels to 3V3 levels for the LCD controller. That should probably still work with the 3V3 F446 device. There seem to be multiple possibilities for the controller type (ili9481 ili9468, ili9488 hx8357, or r61581) so you need to try out different options or try to find some matching Arduino code to check out which controller is the correct one. Perhaps you can also try to read the IR register and find out the controller type.

Google search for "www.mcufriend.com 3.5" to find more info

For the ILI9481 controller the current version of UniGraphic library provides only two constructors. One for parallel interface (8-bits or 16-bits) and another one for SPI. So to use the BUS_8 parallel interface you have to modify the library by trying to define an additional constructor by yourself. In the UniGraphic library navigate to the Inits folder and add a new constructor by modifying the TFT_MIPI.h and TFT_MIPI.cpp files for example as follows.

...
TFT_MIPI(proto_t displayproto, PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char* name ,const unsigned int LCDSIZE_X = 320, unsigned  int LCDSIZE_Y = 480);
...

...
TFT_MIPI::TFT_MIPI(proto_t displayproto, PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char *name, unsigned int LCDSIZE_X, unsigned  int LCDSIZE_Y)
    : TFT(displayproto, buspins, CS, reset, DC, WR, RD, LCDSIZE_X, LCDSIZE_Y, name)
{
    hw_reset();
    BusEnable(true);
    identify(); // will collect tftID and set mipistd flag
    init();
    auto_gram_read_format();
    set_orientation(0);
    cls();
    locate(0,0); 
}
...

Then to use the BUS_8 parallel interface and wiring proposed by Wim create an instance of TFT_MIPI class in your application for instance as follows:

PinName buspins[] = { PA_9, PC_7, PA_10, PB_3, PB_5, PB_4, PB_10, PA_8 };
...
TFT_MIPI myLCD(BUS_8, buspins, PB_0, PC_1, PA_4, PA_1, PA_0, "myLCD");
...