How to show announcements in internal pages?

Application Version - OJS

I’m developing a theme for OJS, I want to show announcements also on internal pages (in the right column, above the sidebar) and not only on the announcements page or on the home page.
The problem is that the $announcements array is passed to indexJournal.tpl with the last n announcement (depending on how they are set in the relative administration tab of the OJS website) while in the internal pages tpl this array is absent.

Is there any way to populate this array without having to add a php function in my theme?