How to set texture index for each tile in tiled material?

[bor_kor]

I want to tile texture array in a single material, but so it takes an array of indices to select texture for each tile in the material from texture array. I’ve ended up with this solution:

But I need to replace selected CheckerPattern node with a material function that will take an array of indices as input, but I don’t know how to make it. I don’t want to use elements, because I use single plane to cover several blocks at once, so they have changeable size, therefore changable amount of elements (also I don’t know, how to setup elements ). I know mostly nothing about materials, so there could be different solution, if you know how to solve my problem any way possible I’d be thankfull.

[bor_kor]

I’ve managed to deal with this! I’ve found this video with tutorial on how to pass array to a material, and with help of it i did this:
First there is an actor blueprint:

Index to Pos macro:

And here is the material:

(Texture Sample is Texture 2d Array with all types of blocks)
And for example if I fill Indices array with [0, 0, 1, 1, 0, 2, 1, 1, 0] and set UTiling and VTiling to be 3, then actor will look like this: