How to separate numbers with brackets in a table

Lennart5 

It shall be no problem with that - if you open the file I attached for the previous post, Excel automatically will show you all formulas and numbers format for the Estonian locale. There is no need to translate formulas published in the text of the post.

However,

1) If you have no file and would like to translate some formulas I'd recommend this online tool https://excel-translator.de/

2) In attached file formulas are adjusted for your actual range. Please note, opening it I see everything for English SKU, you will see the same for Estonian one.

First, to simplify the formulas I added named ranges

Formulas itself are located here

and they are

=INT(
  XMATCH(FILTER(
      INDEX(Range,
          TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
          TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
     ),
      LEFT(
        INDEX(Range,
             TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
             TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
        ),1
      )="["),
      INDEX(Range,
            TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
            TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
      ), 0)/nColumns)+1 &
"," &
MOD(
  XMATCH(FILTER(
      INDEX(Range,
          TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
          TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
      ),
      LEFT(INDEX(Range,
           TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
           TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)),1)="["),
      INDEX(Range,
            TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
            TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)),
  0),nColumns)

and

=NUMBERVALUE(SUBSTITUTE(
  SUBSTITUTE(
  FILTER(
      INDEX(Range,
            TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
            TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
    ),
    LEFT(
      INDEX(Range,
            TRANSPOSE(INT(SEQUENCE(nRows*nColumns,,nColumns)/nColumns)),
            TRANSPOSE(MOD(SEQUENCE(nRows*nColumns)-1,nColumns)+1)
      ),
   1)="["),
   "[",""),
   "]",""
),",")