Bluetooth radiator valves

I am thinking of buying some of these for my house.

https://www.ebay.co.uk/i/184539587068?chn=ps&mkevt=1&mkcid=28

I have HA running on a rpi3 which has bluetooth. Some of the radiators will be in range of that device, but how do I get the other devices to connect to my HA instance? I have some ESP32s with bluetooth but not sure how they would relay the signals between HA and the valves?