Growth % by Week with DAX

Hi all, I want to ask a question. I need to calculate growth rate by weeks. If I selected one week dax have to be calculate last week. If I  choose 2, growth rate have to calculated by these selected weeks. Here is the problem. I look at the examples I see these growth rates calculated for just same year or same month. But in this scenario, it would be 2020/12 ( December) and 2021/1 (january). So if I selected January /  2020 - week no 1, I should see December / 2020 52. week. 

I hope I could explain my situation. 

Thank for attention !