Perform a Matter BLE onboarding through an ESP32 Bluetooth Proxy

Some time ago I followed live the Matter workshop live, but I had (and still have) my Home Assistant virtualized with no Bluetooth hardware passthroughed, so I was not really able to achieve the goal of the workshop.

Today I updated Home Assistant and went to try the Bluetooth Proxy with an ESP32 I had lying around. The Bluetooth proxy works as intended (I have already added Bluetooth integrations). However, when I tried the Matter (Experimental): Commission device service call there was no feedback and the Matter hardware doesn’t seem to be connecting to Home Assistant. I am doing something wrong? Is Matter onboarding through Bluetooth proxies unsupported? Is that procedure technically feasible?

I know that I am using a bunch of experimental and bleeding edge stacks here, but… it doesn’t hurt to ask, am I right?