WTH is there no way to input historic data?

I really like the idea of tracking my (energy) consumption within HA, but currently its either reduced to devices that set values or I have to input the consumption data immediately which is not always possible.

So WTH isn’t there a (new) entity type, integration or whatever where people that do not have the ability to use automatic sensors to input their data for a given date?

Closing as a duplicate of this:

Please vote and follow there.