Amending the tarrif on powerwall 3

[dbplatypus3]

The powerwall 3 seems to have taken a lot of control away from the user , especially the ability to force export.

I have a manual solution and that is to change my tarrif to have two 30 min tarrif changes before my battery charge time.

I know on most days I can export for 30 mins (2.5kw) so I can change the tarrif between 00.00 and 00.30 to have an export price of 100. If my battery is over 50% I can also adjust the 23.30 to 00.00 time slot to also be 100, giving me 1 HR (5kwh) of export.

Describe the solution you'd like
I have seen from the NetZero app that it is possible to update the tarrif on a powerwall 3 from an app....i can only assume it would be possible to update it from home assistant aswell. (Just a guess, I do not know for sure). For UK octopus agile, NetZero will read the tarrif and update the half hourly slots automatically on a daily basis

Being able to do this from home assistant would allow me to automate my exports by checking percentage and adjust export rates per slot automatically.

Note....when NetZero updates the tarrif the rates it sets can't be seen from within the Tesla app.
You can see them from the NetZero app, but that may be the octopus tarrif it has retrieved. In which case it may not be able to extract the rates from the powerwall 3 ... Therefore it would be impossible to check what the rates are....ideally as well as an update of the tarrif ... If possible...a read value function would be a good to have as well to prevent spurious exports because export values can't be seen and are incorrect.