How to create a paradox-style grand strategy map with unreal?

Hello everybody, I am a beginner of unreal engine, and I really want know if I can create a paradox-style grand strategy map with unreal. And how exactly should I do that.

For instance,

gives a example of the effect and color map. Based on the given color map, how can create a border high light effect as the first pic.

I know I can choose the provinces in the game by looking for the corresponding color in the color map. What I really want to know is HOW TO CREATE THE HIGH LIGHT BORDER EFFECT?

I am planning to use the alpha mask. How can I get the corner information from the color map to create dynamic alpha mask?

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