Extend on wifi component is not working,

ESPHome
1

Hello,

I’m trying to extend the wifi component, but it’s not allowed
in my base package I have this.

wifi:
  id: wifiId
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  # power_save_mode: NONE
  power_save_mode: HIGH
  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "${device_name}"
    password: !secret wifi_password

trying to extend it flike this

wifi:
  id: !extend wifiId
  power_save_mode: NONE

but get this error

Failed config

wifi: [source /config/esphome/.base.yaml:1]
  
  Source for extension of ID 'wifiId' was not found.
  id: !extend wifiId
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  power_save_mode: NONE
  ap: 
    ssid: toilet-light
    password: !secret wifi_password

I can just not use extend but I don’t know for sure how that would be handled.

why can’t I use !extend here?