Is there any way to separate data by bytes?
Bytes! Not characters. A non-English character may be more than one byte.
And my source data is byte-based. So I have to do this.

The numbers of bytes of each column:
8,50,30,30,30,50,50,50,50,30,15,8,1,6,25,25,55,55,55,55,12,30,11,3,30,24,55,55,55,55,12,30,11,3,30,55,55,55,55,3,30,30,10,3,1,1,1,30,1,10,4,1,6,3,8,10,6,30,10,6,6,1,1,1,1,1,1,1,1,30,30,30,1,8,8,8,8,8,8,8,8,8,8,8,8,8,1,10,3,30,4,5,7,7,4,3,30,5,19,19,19,19,20,7,8,9,19,19,8,10,30,50,5,35,3,30,3,30,4,30,4,30,25,4,50,3,30,3,30,30,40,30,40,30,40,30,40,30,40,30,40,6,8,50,50,50,5,25,6,6,70,20,1,5,5,3,10,30,25,5,30,8,3,3,8,8,3,5,3,8,8,6,8,2,2,8,12,3,2,8,1,5,5,1

Make it TSV or CSV. (Separate with tabs or commas)

Or any other tool?

TIA!