minecraft-assets/data/minecraft/recipes/light_gray_stained_glass_pane.json

{
  "type": "minecraft:crafting_shaped",
  "category": "misc",
  "group": "stained_glass_pane",
  "key": {
    "#": {
      "item": "minecraft:light_gray_stained_glass"
    }
  },
  "pattern": [
    "###",
    "###"
  ],
  "result": {
    "count": 16,
    "id": "minecraft:light_gray_stained_glass_pane"
  }
}