Because pictures are worth a thousand words… isn’t that why … Azuqua happens?
adding to david’s post
So the Construct - Object Card can be used to make your custom headers.
For each of the headers that might normally be represented as:
In the card below, you see that the card’s field names are replaced with the Header Name.
The Header Value goes in the free form text. (Click on the image to see the rest of it)
I hope this is helpful for the next person, it would have saved me a few hours