Fix#3847. Person posing the question calls this behavior "pull formulas", and wants equivalent handling to be available in PhpSpreadsheet. I can do this for formulas in a single cell; I can go horizontal or vertical or (unlike Excel) both. Nevertheless, I call this "partial support" because I cannot think how I can do something similar that Excel does, e.g. putting 2 in cell A1 and 4 in Cell A2, selecting them both and using the fill handle to extend those to rows below, so that cell A5 will contain 10.
oleibman