Hi Christian,
The Remaining estimated hours history can track the estimates as you described.
We have an example report on our public Demo account showing that:
https://eazybi.com/accounts/1000/cubes/Issues/reports/395713-sprint-velocity-time-tracking
This community post explains another scenario: Get a value of Remaining Estimated Hours measure form specific date
Kindly,
Janis, eazyBI support