Paste one band per line with a left and a right value into the data panel and apply it, and the numbers become a pyramid running out to both sides. You can reverse the order and swap the two sides.
The Bars, Axis, and Text panels let you tune colors, bar thickness and corner radius, grid lines, band names, values, and the legend. The Output panel sets the paper size and the export area, and saves the result as SVG or PNG.