You can install trichromelibrary and exact same version of ‘a’ webview. You still won’t be able to USE that webview for other apps.
If you did, as you say, upgrade the default system webview, please verify it in android developer settings(that it is not version 83) or install FOSS browser from example F-droid a go to a browser check page like https://www.whatismybrowser.com/
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