Collaboration Period setting

In the Finance Report settings it is possible to choose Comment Period, for instance Max(YearMonth). 

This is very useful when I want a comment tied to a specific year and month, for instance a user commenting on the period year 2020 and months Jan-Apr would generate YearMonth=2020-04 (selection fields is Year and Month not YearMonth).

I've tried to achieve the same thing in Collaboration but without success; the option seems not to be available in the Period Hierarchy function or otherwise.