There are two solutions for that.
1- Relatively easy but it will impact your performance.
You have to add Scene Capture Components and print their Texture Render Targets to an UMG widget. For interaction, you can use UMG function overrides such as Mouse Move. You don’t need to use C++ at all.
2- I didn’t try it before and I am not sure thay can be used for packaged projects. But there is an FViewport class. I can try it at this weekend.