I have figured out that in the Play mode, you can mouse over the nodes to see the values inside instead of a cropped text, so at least I know the array has 3 resource types (obviously). No idea how to edit that still, though. I guess it’s something super stupidly easy, as usual…
On a side note, I have exported the BP_Spawner file as .T3D via Asset Actions, no luck there either. Back to digging. 