I would like the ability to add custom columns in "show caption"
For example, being able to show the weight of the wall in the image below, so we can see whether the crane can lift it.
This can be done! The trick is to change the label to «whatever your custom column name is» You should see all the label options when you first type the < < and then select your column. As long as the "Show Caption" option has Label selected, it should appear.