Ah, you might want to see this note. Look at the grab below:
Whilst, map icons do reflect $Text styling (font type: bold, italic, etc) and font/face (Helvetica, Times Roman, etc.) and font size are honoured—as all shown in the upper icon—whilst margins are honoured, lines space is not.
If that seems like a bug, I don’t think it is. Showing any $Text in map icons din’t arrive until v4.6 in 2009 - a good 8 years into the app’s life. even then, not all the affordances shown above were available. In the lower app, intending is supported bet left/right margins and line spacing are ignored.
If you need those missing features to render in a note icon, I’d email a feature request to support, explaining why this is needed (features all have an engineering cost and thus a value judgment when deciding on adoption)