Can a wrap box auto-fill itself depending on whether there is visual space for new child slots?

Development Programming & Scripting Blueprint
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1

I would like to fill the space in my inventory with “Dummie visual black slots” while there is nothing in them. I would like a row to be visually appealing to the eye rather than just breaking the sequence of slots with 1 alone:
Empty dummie slots.

I would like to do something similar like this:

Filled dummie slots.

2

I don’t think there is an automatic filling.
But doing it manually is not difficult at all.

It’s enough to simply count how many elements you’ve created and already know how many there should be when all the rows are completely filled (the maximum number of elements in a row doesn’t change, does it?).

Simply add the missing elements as usual, only with an empty widget.