Import email message, hide the header

Tiddlywiki’s import macro parses a “tiddler-title”.html to extract the title and body of the tiddler.
Is it possible to do the same with an email message? That is, to hide the header portion (visible only on edit)?

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Could you share a “tiddler-title”.html here, I am not sure what that is, how was it created?

Perhaps give an example also of the email message, file or cut and paste?