Select Columns or a region

Right click and choose Conditional Formatting ? Highlight Min Max sub menu

Choose Column-wise to color min and max values column-wise, e.g.

Choose Row-wise to color min and max values row-wise.

Choose Open dialog to customize colors or only highlight min or max

Click > button and choose Generate Script to see corresponding X-Function.

//C1R1-C0R0 means from column1,row1 to last column, last row
//min.use=0 means don’t highlight min
wcolorbycr name:="C1R1-C0R0" min.use:=0;