How do u get Away Temp For Generic Thermostat to Retain After reboot

Configuration
1

i have 2 questions

i learned early this year in the thermostat yaml if you leave out target temperature you dont have to worry about saving it as it retains after reboot

but this does not work for away_temp also away_temp isnt even a attribute under sensor… its omitted from the sensor so you cant adjust via lovelace panel and reboot and it retain it… it only can be edited it the yaml and then its not even a sensor option…

2nd question you can not rename “Heat” button or change the icon… you can change the preset and the “off” button from “none” to word “home” and “off” to whatever u like but you cant do that for heat…
here is the card code it will not change “Heat” to “On” or change the Icon

type: custom:simple-thermostat
entity: climate.bedroom_heater
layout:
  mode:
    headings: false
control:
  hvac:
    some_mode: false
    another_mode: false
    "off":
      name: "Off"
      icon: mdi:power
    "on":
      name: "ON"
      icon: mdi:power
  preset:
    away:
      name: NOT HOME
    none:
      name: HOME

and from the example i used
i dunno what this is

    some_mode: false
    another_mode: false

and if i remove the away_temp from the yaml file it also removes the Away option on the love lace page so you cant force it to show up… to do that reboot trick that retains the target temp by not entering a value… so it only works for target temp not away temp