Create a uservocie requesting this functionality.
https://twitch.uservoice.com/forums/310213-developers
You necroed a 2 month old unrelated post…
OP’s problem was that using Javascript to open the link didn’t work. Not that the link opened in “webview inside Twitch App”
shrug it is consistent with links in other apps on phones, such as Reddit and Twitter for example.
The extension behave is also consistent with how links in chat open up as well. So Extensions behaving different to chat, would cause further confusion, if Extensions behaved differently
And for all I know (off hand) it’s part of the “rules” for External links in Apps on phones in general!