Unable to identify UTM source/medium from Brevo Form lead embedded on Wordpress website

Hi everyone, I am using Brevo form embedding on my wordpress website. However the problem is I am unable to identify the actual source/medium of the lead from. For example, a google ad lead will have utm_source=google & utm_medium=cpc, as compared to FB lead will have none because I am using FB > Make > Brevo.

Any advise on how can i track the actual utm source/medium from website brevo form and auto map to brevo contact attribute?