In my Adafruit_HX8357 library (on Web IDE) you can find a demo called SPITFTBITMAP that contains a void bmpDraw(char *filename, uint8_t x, uint16_t y) which takes a bitmap file from SD and pushes it to the display.
If you strip this down to use your bitmap array instead of a file, you might have what you’re looking for.
The function I borrowed of the original SPITFTBITMAP demo from Adafruit 