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You will need to add hidden fields to your form that can pull in your UTM values when the form is submitted. For example you should add "Utm_Campaign" and "UTM_Source" fields to the form and make them hidden.
You can then click the Edit next to the "Autofill" button for those fields and select "Get Value from: URL Parameter" and fill in "Parameter Name: with "utm_campaign" or "utm_source".
Keep in mind though, that the scenario proposed by Trevor for tracking new lead sources will work only for tracking last-click UTMs and only if the form fill-out happens on the LP that you've linked to. If you want to track first-click UTMs across all LPs and forms, you'll need to custom code your cookies.