you could probably just add a week field to your dates in your table, containing the date of the weekstart of that date. Then you could limit the values in each chart with a set expression to one of the weeks in that month, like
for the scond week in a month, after you selected a month in field MonthName.
An open issue which weeks you want to show, since weeks don't really align with months.
In my attached sample, I just show all week, that have any day of the week in the selected month.
Hope this helps,
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