FX question (fan <> block)

Imagine that you have 5 horizontal stacks of fixtures (with 5 fixtures in each stack) as such:

A - B - C - D - E

1 - 6 - 11 - 16 - 21
2 - 7 - 12 - 17 - 22
3 - 8 - 13 - 18 - 23
4 - 9 - 14 - 19 - 24
5 - 10 - 15 - 20 - 25

To get the effect running so that each row is lit up per step is easy:
“Wave per X = 5” and “Fan <> Block of X = 5”

But if I would want to add a mirror effect (so that the rows light up A+E then B+D and finally C) I think I cant do it in the effect generator alone, and instead have to revert to using chases or cuelists.

Is there a way to get the pattern that I want using only the FX generator?