Using Ease or Lerp nodes with arrays

I have a character blueprint in which I am trying to animate an array of morph targets from one facial expression to another. I have saved each facial expression as an array of float values, which is paired with the array of the morph target names. When run straight from a forLoop to a Set Morph Target node, it works, but of course it does not animate. It just jumps from one expression to the next.

The problem is, when I try adding an Ease node to smooth the change in array values over time, nothing happens. It seems to me that the Ease node is probably only outputting a single value as opposed to an array of values, but the number always seems to be 0, no matter what the original array is. (And to be clear, that Timeline in there is a 1 second timeline starting at value 0 and ending at value 1.)

So either I’m doing something wrong, or maybe it’s just not possible to use the Ease node with arrays. (I also tried Lerp and got the same result). Any ideas?