Tracking Codes in WordPress/Marketo Forms

Hi All - Quick question with a [hopefully] quick solution? 

Currently, we are using WordPress for the majority of our website. Any landing pages and registration pages that require a form, we simply embed a Marketo form into the page. 

We'd like to start using UTM codes for landing/registration pages, but still want to leverage WordPress to host the page. I know how to do this if I'm using a Marketo LP, but is there a plug or secret ingredient to use UTM on wordpress with a marketo form? 

Thanks,

Andy