Understanding How to Control Adafruit NeoPixel in Sony Spresense

An animated LED panel (shown at the beginning of https://twitter.com/make/status/1130204040610979840) at Sony's booth where the Spresense demo is on display. I wanted to do something similar to this

• Sony Spresense Main Board
• Sony Spresense Expansion Board
• RGBLED Panel for Quimat Arduino 256 Pixel QWS03

Create a circuit that combines and so on. https://github.com/adafruit/Adafruit_NeoPixel
↑ I tried running a demo of this library, but it didn't work.

I tried using the exact same circuit and pin piercing method on Arduino(Genuino)101, and it worked, so
The above libraries do not seem to support Spresense, but
Where is NeoPixel's library for Spresense distributed?
If not,
in existing NeoPixel library code Which part should I modify to make it work?