Gqrx SDR for recent versions of the Raspberry Pi OS is available through the software manager. Go to Preferences → Add / Remove Software and search for gqrx. After installation, you will find it under the Internet menu.

Please understand that Gqrx on the Raspberry Pi is very experimental and does not work as well as on a desktop computer. A Raspberry Pi 4 is recommended. IF you have problems, please see User support.