How to center an image in Expo AppLoading?

Question

JavaScript

In app.json I write like this

{
  "expo": {
    "sdkVersion": "27.0.0",
    "splash": {
      "backgroundColor": "#2c2c2c",
      "image": "./assets/images/loading.png",
      "ldpi": "./assets/images/loading.png",
      "mdpi": "./assets/images/loading.png",
      "hdpi": "./assets/images/loading.png",
      "xhdpi": "./assets/images/loading.png",
      "xxhdpi": "./assets/images/loading.png",
      "xxxhdpi": "./assets/images/loading.png"
    }
  }
}

But the image is stretched to the full width of the screen. How do I get the image to be the right size?