Similar to the "Insert Component Link" feature, which creates a reference to a component with an A HREF and a TCMID, there should be a way to generate a placeholder inside content which is intended to be replaced by some other text, like a brand name or some other text string which needs to be delivered but not directly edited by the person editing the RTF component.
Example
Welcome to {{tcmid:123-123-123}}, {{tcmid:123-456-123}}!
tcmid:123-123-123 = "Joe's Burger Shack"
tcmid:123-456-123 = "${profile.firstName}}"
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