Tag option to regard children block as extra property in #incremental flashcards

[htigraine]

Describe the solution you'd like
Tag a children block with something like #extra or #uncard under a parent block with #incremental #flashcard.
The tagged block does not appear as an individual flashcard, but shows up at the back side of the cards of the parent block, similar to how the "extra" property works in single blocks.

Describe how it will help your workflow
It helps add images and extra information to supplement the flashcards with more details than just a single block flashcard.

Describe alternatives you've considered
Adding an "extra" property that functions on an #incremental parent block. This negates the need for the tag option.

Thanks!

[JongPago]

I need these functions, too. I hope it's updated!