In a column, calculate a value per group

Hi , cris1196 

According to your description, you want to move the rankx column logic to the [Select Sttore] column.

Here are the steps you can refer to :
(1)This is my test data:

(2)We can click "New Column" and enter this:

Select Sttore_1 = 
var user =[User]
var _t =ADDCOLUMNS('Table',"rankx" , RANKX(FILTER('Table', 'Table'[User]=user ), 'Table'[Date],, ASC, Dense))
var _t2= FILTER(_t ,[User]=user && [rankx]=2)
return
MINX(_t2,[Store])

(3)Then we can meet your need , the result is as follows:

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

Best Regards,

Aniya Zhang

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