Category Variable?

My Mautic version is: v3.2.1
My PHP version is: 7.3.25
My Database type and version is:

My problem is: i am testing passing categories (sendgrid) via headers in emails. does anyone know if there is a mautic category variable that i can use to dynamically populate the Mautic Category the email is assigned to in the header?

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Same question here. Is there any chance to send categories to sendgrid API ¿?