Customize cards in User Story Map view Merged

I would love to customize the fields on the cards in the Story Map view. Specifically, I want a really easy way to see the estimates...since that's the next step once the story map has been completed. And, when we do that over multiple sessions, there no easy way to see which features have been estimated already. By quickly looking at this view I want to be able to see which ones have been estimated so I can start where we last left off. Today, I use Tags to identify this and I show that on the card in the Feature Board view. So, being able to customize the card, so I can add Tags, would be ideal.