Reference a cell using formula?
You can use indirect() to dynamically reference cells
Use: indirect("string that evaluates to a reference")
example: =Indirect("A"&B2) copies the value of the cell with the row in B2 in column A
In your case, it would be (replace [column] with the desired column):
indirect("[column]"&ArrayFormula(MAX(FILTER(ROW(B:B);NOT(ISBLANK(B:B))))))