How to GTLF material extras to a dictionary?

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You can not as the color is not a string here but the object itself is already “dictionary” like in a sense. You can indeed access a string by doing

orgPBEMaterial.metadata?.gltf?.extras.TextureAmbientOcclusion

or

orgPBEMaterial.metadata?.gltf?.extras["TextureAmbientOcclusion"]

Accessing newColor in the same way would return an array

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