This is a workaround to add line breaks to the Label Layer
NOTE: I can't figure out a way to return all the labels for a Feature Layer here, unfortunately. The Label Layer only returns the labels that will fit into their elements, or not conflict with other labels, as calculated based on the original, single-line label. Splitting these labels into multiple lines might reduce conflicts, or allow them to fit properly within their polygons, but because they were conflicted out in the first place, we never see them.