Hi!! It was a fun challenge - took me quite a bit of time...
At the end I was trying to use only one Multi-Row, but found no solution and had to use two.
Basically if I could "Create a new field" and "Update Existing field" both at the same time, only using one Multi-Row would be possible!!
I had some issues in matching the exact same output but in the end I did manage, took me more than a couple of minutes though...
But here it is