First step is to unpivot your data.
Then you need to define what "current" year means for you. This will be impacted by the filter context unless you tell it otherwise.
Let's assume you mean 2022 as you mention. Create a calculated column of the 2022 value for each of your customers. (You cannot use a measure as measures cannot feed slicers)
Value 2022 = CALCULATE(sum('Table'[Value]),ALLEXCEPT('Table','Table'[Customer]),'Table'[Year]="2022")
Use this column for your slicer.
Which gives you the desired result (albeit a different one than you indicated).