Capture 1st click last click parameters - React | typescript

Hi, I have a project one-page Quote form built with React Next JS.
we already capture UTM parameters once the user submits. but what I want is to capture 1st click and last-click sources and send them to the backend via API (API already built)

please let me know how you can implement this and I want someone to do the changes on my pc. I won't be able to share the code. but we can share the screen via remote. so you can make the changes online.

please pitch me if you really worked on a similar project