how to use advance functions of it8951

[xlla]

while reading it8951 manual, In features section, I found it says support many advance features:

• supports Dither4, Dither5 output
• supports Alpha Blending effect
• supports Fill Rectangle function
• supports ARGB8888/RGB888/RGB565 image input

In Block Diagram section, it even shows a JPEG decoder.

So, how can we use this advanced features? It can reduce the image process time at esp32 side.