As 2018.2 Workflows able to make sublist line/columns mandatory?

As far as I know it should be avaliable, but even at the new release it seems that this action is still missing.

From what I've seen this WF sublist actions are currently nly available on server side actions, not client side which kinda hamstrings the feature IMO, but from the release notes 2019.1 SHOULD have this ability, but only for the items subtab (so for example, expenses subtab on Vendor Bills is not covered)