But this requires making changes to GA/GTag code snippet on both the domains. The snippet in our app is in our control and can be updated accordingly but the GA code snippet added on the App Store page cannot be edited by us. We can only provide the GA tracking code in the App Admin Settings currently. Shopify should provide an additional field to add additional domains for site linking.
Additionally, Shopify should also think of adding a Facebook pixel to the App Store page.