Migrate build target markers to keyboard.json - HI (#23540)

keyboards/handwired/bdn9_ble/keyboard.json

@@ -0,0 +1,52 @@
+{
+  "keyboard_name": "BDN9-BLE",
+  "manufacturer": "KeyPCB/Keebio",
+  "url": "",
+  "maintainer": "merlin04",
+  "usb": {
+    "vid": "0xCB10",
+    "pid": "0x1134",
+    "device_version": "1.0.0"
+  },
+  "bluetooth": {
+    "driver": "bluefruit_le"
+  },
+  "backlight": {
+    "driver": "timer",
+    "pin": "F6",
+    "levels": 5
+  },
+  "processor": "atmega32u4",
+  "bootloader": "caterina",
+  "features": {
+    "bootmagic": false,
+    "mousekey": false,
+    "extrakey": true,
+    "console": true,
+    "command": true,
+    "backlight": true,
+    "bluetooth": true
+  },
+  "matrix_pins": {
+    "direct": [
+      ["D1", "D0", "C6"],
+      ["D7", "B5", "B6"],
+      ["B7", "D6", "F7"]
+    ]
+  },
+  "layouts": {
+    "LAYOUT": {
+      "layout": [
+        {"x": 0, "y": 0, "matrix": [0, 0]},
+        {"x": 1, "y": 0, "matrix": [0, 1]},
+        {"x": 2, "y": 0, "matrix": [0, 2]},
+        {"x": 0, "y": 1, "matrix": [1, 0]},
+        {"x": 1, "y": 1, "matrix": [1, 1]},
+        {"x": 2, "y": 1, "matrix": [1, 2]},
+        {"x": 0, "y": 2, "matrix": [2, 0]},
+        {"x": 1, "y": 2, "matrix": [2, 1]},
+        {"x": 2, "y": 2, "matrix": [2, 2]}
+      ]
+    }
+  }
+}