Different date on tooltip

Hello,

I have a dimension_group called activity_date, a measure called counter and a table calculation where each counter value is offset by 7. Essentially, the data looks like this:

activity_date counter counter_offset
2020-03-01 100 10
2020-02-28 50 50
2020-02-27 30
2020-02-26 100
2020-02-25 200
2020-02-24 500
2020-02-23 100
2020-02-22 10
2020-02-21 50

When both counter and counter_offset are plotted as line graphs, the tooltip for both graphs obviously shows the activity_date. Is there a way to have counter_offset line graph tooltip to display a different date, which essentially is offset(activity_date, 7)?

Following the example, counter line graph’s tooltip would display 2020-03-01 (the x axis value) but counter_offset line graph’s tooltip would show the date 2020-02-22.