UMG uses a 9 Scale Box How to use Texture atlas

UMG uses a 9 Scale Box .Very difficult to use。Why can’t you use the dotted line to set the 9 Scale Box to Unity?

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at Unity:

at Unreal :
set Margin values change 9 Scale Box size. In Unity use Texture atlas (image size 1024*1024) change Button Style,
In Unreal …Texture atlas There? How?

In Unity, the texture atlas contains a lot of image, you can set the button style
In Unreal …Texture atlas There? How?

at Unity Texture atlas

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If an interface contains 100 UI, you need to set styles, then you only need an atlas to load one texture in Unity, and 100 different pictures in UE4