On Android, you can use Firebase Dynamic Links to let user open specific URLs by external browser. I guess that Android webview is equipped with some Firebase SDKs, so this method only works on Android. User still opens link by in-app browser on iOS.
Create a project and a domain for dynamic links
Manually create the link like: https://DOMAIN.page.link/?link=YOUR_DEST_URL
(Or there're many other ways to create links)
For example, post this link on Facebook or Messenger and try it:
https://fugle.page.link/trade-landing-page
Note: Dynamic Links are mainly used to provide consistent and smooth UX across platforms and app installs. This is just a side effect I discovered may help to answer the question, and it may not last long and so should not be taken as the final solution.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…