Recognize Shorten URLs

Is your feature request related to a problem? Please describe.
For example, I would like to add a YouTube video "Big Buck Bunny" to my bookmarks.
https://www.youtube.com/watch?v=YE7VzlLtp-4
However I have stored the same video in shorten URL.
https://youtu.be/YE7VzlLtp-4
The bookmarklet may recognize a duplicated URL, however the shorten URL is not recognized.

javascript:(function(){var a=window,b=document,c=encodeURIComponent,e=c(document.title),d=a.open('https://example.com/nextcloud/apps/bookmarks/bookmarklet?url='+c(b.location)+'&title='+e,'bkmk_popup','left='+((a.screenX||a.screenLeft)+10)+',top='+((a.screenY||a.screenTop)+10)+',height=500px,width=550px,resizable=1,alwaysRaised=1');a.setTimeout(function(){d.focus()},300);})();

Describe the solution you'd like

• Promote if a video URL has been stored in shorten URL in the bookmarklet, and vice versa.
• Automatically shorten the URL.

Describe alternatives you've considered
I would like to know which lines to edit for personal use if the idea sounds not helpful.

Start at the bookmarklet endpoint shown in the issue and compare how the two YouTube URL forms are handled. Clarify whether the expected result is duplicate recognition, automatic shortening, or both, then verify that each form is recognized consistently.