For such a heatmap you will need to install Virtual Radar Server.
But you can also feed to Planefinder. They’ve upgraded their system and you can get such a heatmap there as well. The advantage is that you do not need anything else beside the feed to Planefinder.
https://planefinder.net/coverage/client
A second option would be the installation of ModesMixer2. This is a locally installed application with a web interface giving you such range plot as well (but without an underlying map)
user @abcd567 has created an install script doing the job: