How does the xlsx-style package style the entire row and column? - Codes Helper

the goes like this:
description 1,
ws ["! cols"]: array of column properties objects. Column widths are actually stored in files in a normalized manner, measured in terms of the "Maximum Digit Width" (the largest width of the rendered digits 0-9, in pixels). When parsed, the column objects store the pixel width in the wpx field, character width in the wch field, and the maximum digit width in the MDW field.

description 2,
ws ["! rowBreaks"]: array of row break points, stories [16 br 32]
ws ["! colBreaks"]: array of col break points, stories [8 resorts 16]

for example, I want to set the width of the second column to 100px. According to instruction 1, I write like this (first set the first column as an empty object, and then set the width of the second column)

ws["!cols"] = ([
    {},
    {
       wpx: 100
    }
])

ps: I wonder if there is any way to set the width of the second column without setting the first column empty object. ("description 2" doesn"t know how to use it.)
also has this question in setting the height of a row.