Alternative board coordinates

[sente361]

REQUESTING A VOLUNTEER!
I only have a limited understanding of coding so it would be a major undertaking for me to make what should be a relatively simple enhancement. (I have tried already and run into unexplained problems even getting Visual Studio Code to do the command "git clone"!)
This issue appears to relate to the Shudan section API Reference/Goban/Component/Coordinates Props (as described in the README Documentation relating to Shudan).
When using Sabaki I would like to be able to choose the alternative coordinate system "Simple coordinates". See Senseis Library reference at https://senseis.xmp.net/?Coordinates#toc7
Using Simple Coordinates, on the 19x19 goban the x and y axes are both labelled 1 2 3 4 5 6 7 8 9 X 9' 8' 7' 6' 5' 4' 3' 2' 1'
Examples (default coords first, simple coords second): D4=44; C16=34'; K10=XX; R17=3'3'.
It would only be appropriate to use Simple Coordinates on gobans up to 19x19. (I would be very happy if I only had the option to use Simple Coordinates on the 19x19 goban.)
If it wasn't a difficult coding task then it would be good to have the option to use Simple Coordinates on all goban sizes up to 19x19. Alternatively, it would be good to have the option on the 9x9 and 13x13 gobans. However 19x19 alone would be great!
9x9 goban: both axes are labelled 1 2 3 4 5 4' 3' 2' 1'
13x13 goban: both axes are labelled 1 2 3 4 5 6 7 6' 5' 4' 3' 2' 1'
I hope someone would like to take on this project. Many thanks in advance!

[yishn]

You can use the following function (adapted for x coordinates) for the coordX prop to achieve your desired effect:

function coordX(x) {
  if (x <= Math.ceil(width / 2) - 1) return x.toString();
  return `${width - x + 1}'`
}

Make sure the variable width is accessible by this function. This should work with all board sizes.

[sente361]

yishn, thank you very much for your contribution. However I don't have the skills to implement your suggestion. I hope that someone with these skills will take on the project.