Embed lead source UTM in web form

Our website has a quote form that sends data to Actionstep for our sales and marketing pipeline. We need to identify visitor source (Google Ads, organic, social etc) in the form so we can understand converted customers and costs involved in obtaining the lead - possibly using UTM URL to be embedded into the form.

We are using paid ads, Tag Manager and GA4. The site is built and hosted on Webflow.