Passing URL parameter to Form Input Field

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Guys I am wanting to pass a variable through the URL to the subject of the input form.

So if someone clicks on (this is just an example URL, not sure if it’s accurate):

https://www.mysite.com/contact/contactform?subject=Hey+There

Then when they get to the Contact Page the subject is already populated with “Hey There”.

Is there an easy way to do this?