MQTT in HomeAssistant with stock firmware

I’m on the 3.1.1 official firmware and I setup MQTT to send to my HomeAssistant instance.

In HomeAssistant, I setup the MQTT broker using this video:

I’m able to see messages being received from the AirGradient ONE. What do I do now? How do I get these responses to create a device and sensor entries in HomeAssistant?
I found a big long document about creating MQTT Sensor using a manually created JSON, but is there an easier way, or even if not, anyone willing to share their example to give me a jumpstart?
MQTT Sensor - Home Assistant (

I’ve been using this script to generate my config for a few months.