minecraft-assets/data/minecraft/recipe/polished_blackstone_button.json

{
  "type": "minecraft:crafting_shapeless",
  "category": "redstone",
  "ingredients": [
    "minecraft:polished_blackstone"
  ],
  "result": {
    "count": 1,
    "id": "minecraft:polished_blackstone_button"
  }
}