Guess what the latest update brought?
The feature you requested has been partially implemented. We had the option to Disable Cards for a while, but the latest update added the Suspend feature.
Click any of those 2 buttons (Disable this flashcard
-non-searchable & non-trackable, as far as I know - and Suspend all Cards in X Document
), depending on the option you need (albeit it doesn’t seem to be what you are asking for):

You can however Suspend individual Cards - including Image Occlusions - from a Document by typing /suspend
or by tagging the Card with the Suspend Cards PowerUp
:

To find the Suspended Cards, search for the Suspend Cards PowerUp, then click its bullet to Zoom into the Rem. Example:
