In this tutorial, I will be implementing a complete Minimap and a Map system in unreal engine 5 from scratch. Here, you will get a good understanding on the concepts used in implementing maps and you will be able to implement your own map system or adapt this map template into your game with the help of this tutorial.
https://dev.epicgames.com/community/learning/tutorials/KBYx/unreal-engine-5-complete-map-and-mini-map-tutorial-series
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I wish this tutorial also covered RTS style minimap with static minimap + fog and stuff, could reeeeeaally use help with settig that up right now 
may not be exactly what you need, But I do have some minimap system for RTS games covered here.
https://www.youtube.com/playlist?list=PLNTm9yU0zou4Eulmi8YIfzHiNZEzfbSMk