How did you get it to do that? I have a Pixel 4a, but the Google app will only open results in a Chrome webview, even when I use Firefox or Brave as my default browser everywhere else. I don't use the Pixel launcher if that matters. I would actually like to fix it.

Edit: I figured it out. I'm not allowed to uninstall Chrome, but disabling it made it finally use Brave as a fallback. So they actually implement using whatever browser you want, but they just ignore it unless it's actually impossible to use Chrome.