I wouldn't call those plain text, if it doesn't keep your newlines by default, it's not plain text but a markup language like HTML BBCode is nice and keeps new

I wouldn't call those plain text, if it doesn't keep your newlines by default, it's not plain text but a markup language like HTML BBCode is nice and keeps newlines, but something that uses markdown's syntax for bold and titles, but doesn't remove newline characters, would be ideal