Ahh - so running a web browser (Chrome hopefully) on the Raspberry Pi itself?
I believe you just need to go to chrome://flags and turn on Experimental Web Platform Features and restart.
Experimental Web Platform Features
However the idea of the MQTT bridge is not to need Web Bluetooth, and to allow you to view the webpage on any device while using the Raspberry Pi as the bridge.
There's a bit of an example here:
You should just be able to check on the /ble/advertise/ BLE topic and extract any data (eg the meter reading) that you want...
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