My first post ) adding query string to search form widget

[pom4ik]

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.

...&source=<desc>

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