bedrock-samples/resource_pack/textures/entity/npc/npc_construction_1.texture_set.json

{
    "format_version": "1.21.30",
    "minecraft:texture_set": {
        "color": "npc_construction_1",
        "metalness_emissive_roughness_subsurface": "npc_construction_1_mers"
    }
}