After appropriately hosting your app, you can configure your standalone binary to pull from your own server using expo build:ios --public-url <path-to-ios-index.json>
Additionally, you can override where the assets are hosted using assetUrlOverride field in your ios-index.json, there’s more info on this @ https://docs.expo.io/versions/latest/distribution/hosting-your-app/#asset-hosting
Thanks for raising the question 