Narrative Fields: the option to require the input boxes individually rather than the whole field

According to the Narrative widget settings:

If this widget is set as Required*, all the textboxes must be filled before the form can be submitted.

However, if this is set to Yes, and if in the question's general properties Required is set to No, then it will still require it to be filled out. What I want is that it shouldn't required, but if at least one textbox is filled out, then I want all textboxes to be filled out as well.

I'm sorry, but that is not an option in the narrative field widgets. If you set it as required, all input boxes must be filled before you can submit the form. 

I have raised this thread to our backend team as a feature request. Please note that we cannot give you an estimate as to when this feature will get implemented or if our developers will consider adding such in the future, but as soon as we have an update, we will let you know here.