Card Sort stylized labels

I would like some of the cards in a card sort to be labels, like in slide 2 of this activity: [Card Sort: Modeling • Activity Builder by Desmos]

In Activity Builder it shows that the stylized label cards are ReadOnly (which isn’t an option), with no accompanying code in the CL. Obviously Desmos has additional tools that aren’t available to users, but I’m just wondering if there’s any way to make labels like this.

Design your label in another program and capture it as an image, then insert as an image card.

I agree it would be nice to designate certain cards as headers only. I hope that feature gets released to the rest of us soon. However, I don’t see any way to do it now.