I’m learning about date table patterns in power bi from https://www.daxpatterns.com/patterns/

I really like the standard time related calculations approach wherein they are creating a calendar table for year, qtr, month. They have shown show to calculate YTD, YOY, etc. https://www.daxpatterns.com/standard-time-related-calculations/

I want to enhance this table to add 2 columns: Year week, Week. I’m not sure why they don’t already have these columns.

My question is whether the above is OK to do, or do I need to use the table that they have shown in the week related calculations (https://www.daxpatterns.com/week-related-calculations/)?