How to create borders for entities with RealityKit?

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I created a globe model in Blender and imported it into Reality Composer Pro to add it to my app.

Each country you can see is its own entity. The problem is that the countries need borders to improve the user experience. Currently, I am also trying to solve this directly in Blender, but I cannot find a solution. So I am looking for an another way to solve it.

Can it somehow be done programmatically with Reality Kit? Or is it possible with shader graphs in Reality Composer Pro? Or do I need to learn Metal to solve it?

I would really appreciate to get ideas and help.

In the best way, the solution also solve the problem with the little gaps between the countries.

If you need further information, please let me know.