Spread evening -> morning price

[notalotofexperience]

I am using this plugin for Dutch power prices and it is working great. I am also using the spot sensor so I can calculate when my battery should charge against the lowest prices.

I made some helpers to decide if there is a sunny forecast and if the spread between lowest and highest price (current day) is more than xx cents otherwise I won't charge or discharge my battery.
So far so good. But I would like to add another comparison that checks if the evening price of today has a certain spread in price against tomorrow's highest and lowest prices.
So for instance when the lowest price for tomorrow is higher than today's highest price then I could decide to discharge the battery only to a certain SOC in the evening. Or when today there is a small spread, so the battery isn't allowed tor charge, I could decide to charge anyway is tomorrow's prices are much higher.

Anyway I would like to have two entities for highest and lowest price for tomorrow (when they are available) like there are the two entities for the current day.
How can I create these two entities?

[notalotofexperience]

Nobody knows how to do this?