Limited support for newlines in labels

**Is your feature request related to a problem? Please describe.**
We have some labels in forms that would benefit from some blank lines

**Describe the solution you'd like**
It would be good if there was some simple way to put \n or \ or some linefeed markers into
form text.

**Describe alternatives you've considered**
We could have a label for each and every line, though that feels pretty heavyweight.

**Additional context**

vs

The issue does not name a file, test, or entry point. Start by locating how form labels are rendered, then compare the provided examples and decide which line-break marker is supported; this is done when labels can display intentional blank lines without requiring one label per line.

Written by the indexing model from the issue text.