You might want to add the post function to the create transition of the workflow so that the post function gets executed every time a new issue is created.
Target issue
Choose Current issue
Field
Choose your desired Insight field.
Value
In the popup, choose the value Set field value manually (parser expression)
Expression
Set it to Basic text and use the following expression
ObjectKey-1
In order to display multiple objects, make sure that the Multiple option is checked in your Insight custom field configuration as you can see below:
Expression
Your expression would be then like the following if you want to display 3 objects: