I believe we used to be able to type "#label" when adding a card to create a new card with a label. I think there were other "shortcuts" too. Unfortunately "shortcut" is also what we call the hot-keys so searching for how to enable this is not finding much.
I have been out of pocket for a few months and when I came back this isn't working. Did I miss a update that got rid of this feature. I really hope this is still a thing.