Because I use Chrome as my default browser (which does not allow for bookmarks in the Home Screen), I have created a bookmark using the Shortcuts app and the following commands:
Open URL in Chrome
Stop this shortcut
However this has the disadvantage of multiplying the number of open tabs if we do not diligently close previous ones.
Is it possible to scan existing open tabs in Chrome using the Shortcuts app and search for a given URL? This would allow me to only open a new Stack Exchange tab if there is none already open.