Hi Bev,
Unfortunately there is no way that I am aware to pull the Raw Data Last Updated field into a column on a dataset.
That being said, I've helped other customers add this to a report to show the timestamp the raw data was last updated. To do this you could.
1. Insert Freshness Table

2. Show the "Raw Data Last Updated" column:

3. Filter this table to just the dataset(s) you want to show on the report.
I understand this won't give you a column in a table to manipulate, but it may give you an idea of something different to try. I am also unaware if you could create a lookup against the freshness table in a transform to pull this data in to your transform.
Seth