Scoutbook was updated last night to support this.
Internet Advancement also supports this.
Scouts BSA Scouts can use Citizenship in Society as one of the Eagle-Required merit badges for Star rank requirement #3 or Life requirement #3
For the rank of Eagle Scout, it can be used as an optional merit badge until July 1, 2022. For Scouts who have not completed all requirements for the rank of Eagle Scout by that date, Citizenship in Society will become required.
More information on this merit badge can be found here: