Programmatically creating Express Object Form, Add Association + Settings?

Hey when I’m trying to build a Form Programmatically for an Express Object, how do I go about adding an Association, and defining the settings for that?

Turns out it is:


And $target_property_name is the handle that is used for the other Express Object.

Relevant API Documentation here : Concrete\Core\Express\ObjectBuilder\FieldsetBuilder | ConcreteCMS API

(although that hyperlink is for v8.5.7, your version may vary)