Hey there, @jesusazogue! We see that you are asking about Horizon Worlds being available in Belgium. We know how important it is to be able to play the games you want to play, and we want to keep you updated as often as we can!
At this time, there has been no word of Horizon Worlds being available in Belgium. This is the current list of countries that support Horizon Worlds at this time. If you'd like, you can suggest to add more countries to be available for Horizon Worlds through our Ideas Page. Once there, other users and developers are able to share their suggestions with each other to make VR better for our users!
Your best bet would be to ask within the Horizon Worlds Discord found here.