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Last tested: Jan 21, 2019
Use a custom filter:
${week_of_year_dimension} = ceiling(diff_days(date(extract_years(now()),01,01),now())/7)
Here we're getting the difference in days between January first of this year and today and dividing that by 7 to get the number of weeks. We use ceiling to round it up so we get the current week.
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