luci/applications/luci-app-example/root/usr/share/rpcd/acl.d/luci-app-example.json

{
  "luci-app-example": {
    "description": "Grant UCI access to LuCI app ecample",
    "read": {
      "ubus": {
        "uci": [
          "get"
        ]
      },
      "uci": [
        "example"
      ]
    },
    "write": {
      "ubus": {
        "uci": [
          "set", "commit"
        ]
      },
      "uci": [
        "example"
      ]
    }
  }
}