rn-ml/lib/appicon/template/ios/Contents.json

React Native cli tools

{
    "images": [
        {
            "filename": "1024.png",
            "idiom": "ios-marketing",
            "scale": "1x",
            "size": "1024x1024"
        }
    ],
    "info": {
        "author": "xcode",
        "version": 1
    }
}