Super Send does not generate DMARC values, your email provider does. There is no set up required in super send for DMARC, again that all happens within your email provider.

To set up DMARC:

Outlook: take a look here https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-dmarc-configure?view=o365-worldwide

Set up DMARC with Google workspace: https://support.google.com/a/answer/2466563?hl=en

Here's a good article on setting up SPF records: https://dmarcly.com/blog/spf-dkim-dmarc-set-up-guide-for-g-suite-gmail-for-business

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