In principle, you could do things like
forming the range string for import based on the row of the current cell.
But I do not actually recommend this. You should not use
importrange as an individual cell reference; it's a serious drag on performance. As the name suggests, its purpose is to import the range of all cells you are going to need (maybe the whole sheet you are referring to); put the imported range somewhere (on a separate sheet, perhaps) and work with that data normally. For example, use
once and then refer to those imported cells.