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@Gordon
The SK6812 datasheet you link to mentions 1mA in it.
I'm afraid as the others say, a single GPIO may not be powerful enough to switch it - the only time I've seen a neopixel indicator on a board it was switched with a transistor. I'm struggling to find actual figures but I definitely thought that all on it could draw around 60mA (as it's basically 3 LEDs that get driven quite hard) and I remember from using them that a string of them drew a lot of power.
Having said that, the 1mA figure is om the SK6812 datasheet (and presumably the WS2812), however looking at the APA104 datasheet it shows 1uA - so it may be that by using a different part you can avoid having to switch the LED at all.