Prefill Fields from URL

Hi,

Yes, you can. This is built into the core CF7 and works with this plugin as well. Here is some documentation from the core CF7 plugin:
https://contactform7.com/getting-default-values-from-the-context/

Here is an example where you can populate a hidden field also:
https://cf7msm.webheadcoder.com/cf7-multi-step-forms-pre-filled/