Thank you so much for your excellent support.
Right now we solved this problem by adding an indent to the structured tag
'indentLeft' => 40
to Have it a bit further in. This way we can use margon 0 and still get everything lined up. It l works for us if it's aligned with the label above (even better). That introduced some new challenges though.. So I might have to look into your solution but for the other side of the table :-)