KPI Chart : Time Axis and Comparative Values different bin

Hi All,

i have KPI chart values tab set as below.

as seen above, the Time axis is binned by Month, and i kept comparative value as difference % from previous month as below.

Now, the % change will be very low in the beginning of the new month and keeps changing till the month end.

instead of previous month, can we have last 4 weeks so that we can compare with equal time period ?