Try something like this:
(txt, codepage is 1252, no labels, delimiter is ';', msq);
let vDate = mid(FieldValue('@1',1),15, Len(FieldValue('@1',1))-21);
drop tables Tmp;
'$(vDate)' as Date,
(txt, codepage is 1252, embedded labels, delimiter is ';', msq, filters(
Remove(Row, Pos(Top, 1))
What I did was loading only the first column to get the date created. Then i created a variable to get the value of the first field of the first column and did some transformations to get the date (you probably have to fine tune this)
Then I loaded the whole table another time, removed the first row and added the data variable as a field.
Hope this helps.