How to use Geolocation Targeting on Essential Announcement Bar app
If you are looking to have different Announcement Bars in different markets and strictly be displayed in some countries (where you can change messages and styling). In that case, you should utilize the Geolocation Targeting on the Placement tab.

Simply duplicate the Announcement Bar (there is a button "Duplicate" on the top right for your convenience) for each Market, translate the messages accordingly, and on the Placement tab choose which country should see the Announcement Bar:

Only those who are physically browsing from the set countries can see the Announcement Bar.
Geolocation targeting is available on the Essential plan and higher. If a store has both country-specific bars and an All world bar, visitors in the targeted countries can see both bars.