Hide files based on extension?

I am running the latest version of nextcloud, and Im getting it setup at a small company. I have a folder structure containing all our CAD drawings in their original format, and PDF format. Is it possible to hide files of a certain extension from users in nextcloud?

As an exmple, if I have a folder with “.SKF” and “.PDF” files in it, can I make nextcloud hide only the “.SKF” files and show all other files in that folder?

Anyone? This seems like it would be something that’s doable.