bedrock-samples/resource_pack/textures/blocks/chiseled_bookshelf_empty.texture_set.json

{
    "format_version": "1.21.30",
    "minecraft:texture_set": {
        "color": "chiseled_bookshelf_empty",
        "metalness_emissive_roughness_subsurface": "chiseled_bookshelf_empty_mers"
    }
}