Function to 'go back in time'

[weasel3]

No other app has this feature. This is your opportunity!

For taxing reasons I have to prove how much bitcoin did I possess at a specific date in the past (mostly 31.12.xxxx).

Currently proving this is horribly complicated b/c of the lack of Blockchain explorers that support x/y/zpubs. I wish there was a history function in Mycelium where I simply can type in a Date and the app shows me the x/y/zpub-combined historical account summary to that date to take a screenshot of.

The implementation of such a function is in my view an easy task b/c all information are already present in the app.

Would you please consider adding such a function?