Recommend that you join the SC Editors on the Waze South Atlantic Discord Server.
Looks like you are able to add the RTCs.
If you get a chance take a look at adding Tamper Monkey to manage scripts and then the Waze Advanced Closure script.
Entering the start and stop dates and times (can specify what days of the week) and then click add and it can add all the closures for months.
I will post a link when I get to a spot that has access.