The issue that we have is that in all of our input fields, we use [Enter] to submit a change to the field.

However, in cases where users are expected to insert paragraphs of text into the Data String field, the user is not able to press [Enter] to create Line Breaks in the text.

Suggested solution: Many applications that have similar functionality where [Enter] is used to confirm a change in a text field, [Shift+Enter] is typically used to create a Line Break without submitting the selection.
(Example from Slack: [Enter] Submits a message, but [Shift+Enter] allows the insertion of a Line Break without sending the message)

Note: Text Copy-Pasted from a text editor, that does contain Line Breaks, will correctly insert the Line Breaks when pasted into the Data Property.