How to use Large Streaming Virtual Texture to create AAA landscapes in UE5

   I want to use SVT to create an AAA-level map without tiling, with a virtual texture size of 64K x 64K, including BaseColor, Normal, and RMO textures. After creating and exporting the textures in Photoshop and importing them into UE5, I received an "out of memory" error and the engine crashed. Even after reducing the texture size by 1/4 and recreating and importing them, it still crashes, until the texture size is reduced to below 1GB, which is not what I want.
     Later, I used RVT to dynamically bake an SVT through VirtualTextureVolume. However, this is not a real SVT, but rather an SVT Builder that only works in conjunction with RVT to optimize the rendering performance of distant objects. It cannot be sampled in materials and when I increase the Build Levels, it starts to prompt "out of memory" again after reaching around 1GB, and then crashes. What should I do?