How to use calendarweek week(datetime) as time axis?

After using “G” for hours and hours w/o success, I desperately tried to get help for my issue here, since oct '21… but I guess I have misplaced my question in the wrong forum.
Could somebody please have a look as meanwhile I am running out of time to deliver, thus I might have to use EXCEL instead if I can’t get Grafana graphs working soon.
Thanks a lot