This feature was listed in #3 , but not implemented.

#207 has a complicated workaround (but keyword transforms does not exists anymore?), and says "there isn't a "thousands" separator option, but we could potentially add on".

Practical example, data is two first rows from table 2 on page 10 in https://www.istat.it/it/files//2020/05/Rapporto_Istat_ISS.pdf

a=CSV.File(IOBuffer("""
       Alessandria 95,7 98,2 -12,8 91,0 1.199 693 222 18,5
       Ancona 76,6 84,3 -10,7 49,4 704 528 86 12,2
       """), delim=" ", header = false, decimal = ',')

Row 1, column 6 would ideally be Int 1199. Here comma is a decimal separator and period is a thousands separator.