Hi Mousset!
Thanks for getting in touch! 🙂
Unfortunately, that is not something already built-in into the tribe bar functionality. It may be possible but would definitely involve custom coding.
Bear in mind, that the search input searches for keywords in the events, but the geoloc input searches for places using the Google Maps API.
You might want to check out our Filter Bar plugin. It may not be exactly what you are looking for but it has some powerful capabilities to filter by country, city, state and many other filters like venue, organizer and more.
I hope that helps and let me know if any other question.
Best!
Victor