Notifying anyone following this thread that a discovery has been unearthed!
@skyehansen was sharing this trick by @the_real_melinda_layten in a larger discussion about multi-select fields. I then realized this is how we can insert unicode control characters into a value expression, without having to rely on the clunky workaround that was previously described.
CONCAT({owner}.{name},"\u000A",{owner}.{emailAddr})This makes it very easy to insert a line break in a calculated field or column, by simply putting in the unicode \u000A in your expression where a line break is needed.
Even more importantly, this can be used to replace column sharing in many, many situations. A single calculated column can replace multiple shared columns using this approach - and will also be easier to re-arrange within a view since there are no column number prefixes that have to be considered.