setWith is impossibly difficult -- lacks proper documentation

[aprilmintacpineda]

Google Sheets use pixels for column widths.
I'm using LibreOffice which has centimeter.

I constructed this function:

function calcColumnWidthFromPx(desiredWidthPx: number) {
  const inchToPx = 96;
  const inchToCm = 2.54;
  return (desiredWidthPx / inchToPx) * inchToCm;
}

Which converts a width from pixels to centimeter, based on 96 pixels = 1 inch = 2.54 cm. However I still don't get the correct output that I want, I want to set the width of column 1 to 149px but it seems impossible because the unit of measurement being used by setWidth is not documented.