How to show all invisible (unicode) chars

Is there any way to show in the editor all unicode characters? i don't mean display them properly, i mean just see that there's a non-printable character (using a box or ? or anything)

We had an issue due to an entry with a weird unicode char and even when I enable "show whitespaces" it doesn't display anything at all

Unfortunately (or fortunately) this forum seems to remove unicode chars so I can't paste the sample string here, but you can see it here

https://paste.ubuntu.com/p/mswNCf5TRT/

If you paste that string in https://www.soscisurvey.de/tools/view-chars.php you will see that there's an invisible char

What i'm trying to do is within IntelliJ to be able to have confidence that there's no secret chars. I can't just search for this \u202c char because there might be other invisible chars as well