Working on it.
An snes palette works on RGB consisting of 256 colors.
Each game could choose its own 256 colors from a wider range.
The hard part is to base it on an original Super Nintendo palette.
I have made some attempts, I am very close to the result but not 100%.
One idea is to split the colors to 5 bits, other idea would be just to base on a game exists and extract the palette.
Let's see what I can pull out