Updated Version of @NoStage3, @rernat script solving a problem with emissive materials.
I just added one line to skip materials with "_EMISSION" keyword enabled.
UnityAssetVamifier is a simple plugin to convert Materials used in Unity Asset Bundles (.assetbundle) from Unity default shaders (Roughness setup preferred) to the builtin VAM shader and expose the shader properties in the UI.

All the credits go to NoStage3

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