Setting your own date range

I'm wondering if it's possible to set the range of our fiscal year. We report Q4-Q3 (October 1st being the start of our year and September 20th  being the final day of the year). Unfortunately, because of this I can't do a lot of the YOY views. For example, last fiscal year for us was Q4 2019 through Q3 2020 and this year is Q4 2020 through Q3 2021 and when I group 'by year' which is the largest bucket, it does it by calendar year and I can't separate them.