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

{
  "type": "crafting_shaped",
  "group": "stained_glass_pane",
  "pattern": [
    "###",
    "#$#",
    "###"
  ],
  "key": {
    "#": {
      "item": "minecraft:glass_pane"
    },
    "$": {
      "item": "minecraft:light_gray_dye"
    }
  },
  "result": {
    "item": "minecraft:light_gray_stained_glass_pane",
    "count": 8
  }
}