How to get material/decal size for Deferred Decal materials?

Development Rendering
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How to get material/decal size for Deferred Decal materials?

I know, that if you work with UI material domain, you can use TextureCoordinates[2] to get the image size which this material is applied to.

Material render size in UI materials

However, this does not work with decals. Does anyone know how I can get the decal size in a deferred decal material?

Thanks!