@dannie360 I recommend you not to rush into things without evaluating first. @ericgoodsoulbad just mentioned that webview is not available on PySide6, and since you are asking questions about it, it will not work.
The fact that you asked how to install pyside6, make me think you are not familiar with the documentation nor wiki page, please take a couple of minutes with a coffee/tea and get familiarized with those two sources of information: doc.qt.io/qtforpython (docs) pyside.org (wiki)