There is a similar service in The Netherlands, NL-Alert. Maybe the same thing? It does not work on SailfishX, as far as I know.
According to the description NL-Alert is based on cell broadcast, http://www.cellbroadcastforum.org/whatisCB/

Found an article on TJC: https://together.jolla.com/question/...dcast-support/
Seems implemented in ofono. Apparently waiting for some volunteer to code it...