"Oxford Dictionary of English" not on list of dictionaries

( Samsung S9 Android 10 Firefox 104.2.0 ) When I highlight a word and want to look it up in my dictionary, some of my installed apps are shown, but not the app “Oxford Dictionary of English”. Can I customize this ? Or could the developers add it ? Also see https://github.com/mozilla-mobile/fenix/issues/27051

So … nobody knows whether the list of dictionaries is customizable by the user ?