Here's the steps to make this visible in REST.

1. Edit your dataset.

2. Add a formula.

3. Name it something you want to see appear in REST

4. Change output type to STRING

5. Select the field which appears in your data grid already (assuming you encountered this problem and already have the column/data field in your analytics query)

6. The field will appear on the report w/ this format:

   1. ([fieldname]#display)

Save, drag it into your report, remove the old column, update the alias using the info button on the dataset, save dataset, validate pulling via REST