OK. This works
description: This is<br>a multi-line<br>text...
but this doesn't ?
description: This is<br>
a multi-line<br>
text...
This just prints out as it is, including the \n
description: This is\na multi-line\ntext...
This doesn't work either...
description: |
This is<br>
a multi-line<br>
text...