It would be handy if I could produce something like this:

This is a link
This is a multiline description associated with that link.
It can contain line breaks.

Easiest way to do this would be to add an optional "description" key to the link form, which knows that newlines should be replaced with <br>.

So...

select json_object(
  'href', 'https://simonwillison.net/',
  'label', 'This is a link',
  'description', 'This is a multiline description associated with that link.
It can contain line breaks.')