How to use XL YU XR and YD wire

Wio Terminal schematics shows that PC10 to PC13 pins of the ATSAMD51P19A are connected to the ILI9341. They are labeled LCX_XL, LCD_YU, LCD_XR, LCD_YD.

They comme in addition to the SPI 4 wires connection (LCD_MISO, LCD_MOSI, LCD_SCK, LCD_CS), and in addition to the (LCD_BACKLIGHT< LCD_D/C and LCD_RESET).

What are these pins used for? Are they used by Seeed_Arduino_LCD library?

As the screen is below a transparent hard plastic cover, I doubt touch is implemented and thus, that those wires are of great help.

Please refer to the thread Wio Terminal Screen Touch?