Showing custom message in OpenNMS Horizon home page

Problem:

Show custom outage message in Home page

Expected outcome:
Dear all, we would like to show any outages that are currently happening in our environment as a scroll message in OpenNMS home page. Can anyone please help me.
OpenNMS version:

26.2.1
Other relevant data:
NA
[e.g. logs from OpenNMS, error messages etc]
(for logs, surround with three back-ticks to get proper formatting, e.g.)

logs