How to output ${expression} in Freemarker without it being interpreted?

This should print ${person.name}:

${r"${person.name}"}

From the freemarker docs

A special kind of string literals is the raw string literals. In raw string literals, backslash and ${ have no special meaning, they are considered as plain characters. To indicate that a string literal is a raw string literal, you have to put an r directly before the opening quotation mark or apostrophe-quote