Nest thermostat: Need to set heat source from HA

Third party integrations
1

There is a configuration parameter, set Heat Source in Nest thermostat.
Is can be “Always Primary”, “Always Alternative” or External temperature for heat source switch point.
I need to be able to configure it via script (want to use electricity while Powerwall not depleted.)
Any advice welcome
Thank you in advance.

2

I didn’t realize Nest had these parameters you could change through HA. I just changed to a Honeywell T6 to allow change of these settings easier. My Powerwall is for emergency backup power. When mine kicks on I have an automation for it to change my T6 to backup (propane heat) from my heatpump, to not drain the battery in the event of an outage.