search widget append query string parameter

[romanfain]

hey, I need to add a query string parameter to the Search Form.

I have two search bars on the page (one popup & one in a CTA) we need to track usability by passing a query string for example.

https://staging.domain.com/?s=search+for+something&lang=en&**source=popup**
https://staging.domain.com/?s=search+for+something&lang=en&**source=content**

Using Elementor Pro any advice on how to tap into the search event, maybe using add_query_arg.

TIA