First remove the from dynamic data type function. It does nothing for you. The chart does what you want by keeping a history but the array indicator won't you need a way to keep a history with a shift register. Just delete the array indicator to be able to run.
Right click the terminal leaving the for loop and choose last value which turns off auto indexing. This returns a scalar instead of an array.
Right click the terminal leaving the for loop and choose last value which turns off auto indexing. This returns a scalar instead of an array.