iTunes Connect does not have any metric for presenting number of uninstalls. Developers do not have any callback for uninstall and hence can not call any API, that could have been used as a counter or something.
There are number of attribution tools in the market that can help you with tracking uninstalls.
Uninstall Event Tracking Solution involves working with Push Notifications and creating a daily ping service.
Firebase App Indexing gets your app into Google Search. If users have your app installed, they can launch your app and go directly to the content they're searching for. App Indexing reengages your app users by helping them find both public and personal content right on their device, even offering query autocompletions to help them more quickly find what they need. If users don’t yet have your app, relevant queries trigger an install card for your app in Search results.
App Indexing lets Google index your app just as if it were a website. For users with your app installed, deep links to your app - on Android or iOS - appear in Google Search results, allowing users to find exactly the right content within your app.
In addition to driving re-engagement, App Indexing on Android will also surface install buttons for users who do not yet have your app installed. Since 1 in 4 appsare already being discovered through search, App Indexing is a simple and free
method for acquiring new users…
Headless mode allows running Chromium in a headless/server environment. Expected use cases include loading web pages, extracting metadata (e.g., the DOM) and generating bitmaps from page contents -- using all the modern web platform features provided by Chromium and Blink.
To use headless, start Chrome with a command line flag: