Check out ESP32-based projects like ESP32-CSI-Tool or the FreqSense library, which can implement WiFi sensing with minimal hardware and completely under your control.
Interesting, mind sharing links to these?
I found a GitHub repo for "ESP32-CSI-Tool" that seems related to Wi-Fi Sensing, but zero references to "FreqSense" in the Wi-Fi/RF context.
The only FreqSense I found is an obscure academic paper on speech recognition that doesn't involve any form of hardware.