"Soft Return" character (Shift-Enter) on iOS?
There is actually a way by using the microphone symbol on your keyboard and then saying “nieuwe regel”. That is Dutch for “new line” but I am not sure what the exact english equivolant is. But it works, it creates a soft return.
A soft line break is not supported by the iOS keyboard (nor, to my knowledge, by SwiftKey or Swype), but you can copy/paste an existing soft return from any other text.
I cannot give an example here, because the Stack Exchange markup doesn't know a soft return either. Instead, you can see this in action in the following Quora thread: How do I enter a soft return character (Shift-Enter) on iOS?