Recreating shared dataset

Hi there,

We had an employee which was responsible for all PBI issues in his department.

He created reports and datasets and shared with others, who created their own reports based on shared datasets that he created.

That employee left, and IT immediatly deleted all his folders. So now the original PBIX files with the original data sets are gone.

The shared datasets started experiencing some issues in calculated columns, and his team mates contacted the BI department.
Since all their reports are live connection, using PBI Desktop we can't see the DAX behind those calculated columns.

Is there a way to recreate / retrieve the original dataset from shared workspace, so we can investigate the issues and retrieve the code?

Thanks!