Hidden Profile Color

There are 15 colors specifically called out with IDs. 14 colors and Transparent (-1). Examples:

  • COLOR_PINK = 0xFF00FF
  • COLOR_TRANSPARENT = -1

There is another hidden color, called the USER'S PROFILE COLOR. And it is somehow embedded into the 16 color palette. Has anyone figured out how to draw in the current "profile" color?
I did find discussions about this over 5 years ago with lots of requests to allow access to this color. Apparently it is used to draw the borders around data fields. And it does make sense to allow developers to draw with this color. Alternatively, that border color is probably a fixed color for DAY and NIGHT. So someone may have figured out the RGB values to mirror that color?