Hi krass, one possibility - since an ellipse is a circle that has been scaled in one direction you could generate a circular array and then use Transform > Scale > Scale 1D to ellipsify it. That would go something like this:

Draw in additional reference circles:


Transform > Array > Circular:


Transform > Scale > Scale 1D:


Boolean difference:


Another possibility for a general "array between 2 curves" would be to use sweep or loft to build a surface between 2 curves and use that as the target surface for Flow. The base surface for the Flow would be a plane with a straight array along it in one direction.

- Michael