Using Enterprise Insights, how can I calculate the Date that a PI changed for a Feature?

[Jason]

I am using Power BI to analyze Jira Align data coming from Enterprise Insights.  I am trying to work on a scope change report for Features for a given PI.  I don't see a table or data of when the PI changes for a given Feature.  How can I calculate the date that a PI changes for a Feature using DAX?

[Sam Tsubota]

@Jason You need to use the current_DW.Feature History table which records changes to Feature data. The Feature Fact Valid From column is a date time stamp of when a change is made to a feature record and the Feature Fact Valid To column is the end date time stamp before the record was updated. You will need to compare records in the history table when the FK Program Increment ID value changes. 

[Jason]

That is a helpful starting point.  This type of search for when a given field is changed on an issue seems like a very common and important reporting need.  Would you happen to know a good of way of solving this using DAX commands with a calculated column in Power BI?