MQTT bridge to serial Tasmota

Hello,
I have a problem obtaining the status of an entity.
I installed the Tasmota software on ESP8266 and connected MAX3232 to control my stereo amplifier.
I send commands via MQTT with the following text: “Main.Power = Off” or “Main.Power = On”
It works very well, but Hassio does not show me the state of being.
The MQTT return I receive from ESP8266 is as follows:

{
“SerialReceived”: “Main.Power = Off”
}

How to correctly add state_on: and state_off: configuration in yaml?