Define Default UTM Value if not set in the URL

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Thanks for this very useful plugin. I am using this for the last 1 month with contact form 7. The only problem that I am facing is that I am unable to set default UTM parameters values.

Case 1
My tracking url is http://www.xyz.com?utm_source=google_campaign
As soon as person submit the form using the above tractable URL, we can see UTM Source was – google campaign.

This is what I want to achieve in Case 2
My tracking url is http://www.xyz.com
As soon as person submit the form using the above without tractable URL, we can see UTM Source in the form – google campaign (default value).

So, basically is there a way to configure it like – If utm value is not present in the url, use default value.

Please suggest.