Sorry, but I don't follow.
Role-playing is about the process by which you make decisions for the character. If you make decisions by pretending to be the character and evaluating the information from their perspective, then that's role-playing. Whether you narrate it in the first-person or third-person is irrelevant to that.
When you invent details that the character has no control over, like the historical or cultural significance of an object (that the character doesn't even know about), then that's not role-playing. I'm not trying to pass judgment that it's good or bad, except to say that I don't personally enjoy it, but it is not role-playing in any form when you make that decision. I mean, who do you think you're pretending to be - which role do you think you're playing - when you decide the meaning of that scarf?