Currently you can manually define a list of fields to restrict data values in ArcGIS Online.
You can even "Generate List" from the data in a field at a given time.
The problem is, you do not always have all data categories represented in a feature dataset when you want to set up a list (thus, Generate List only generates a subset of the attributes that you want in the list).
I would like to see a "List Import" option in ArcGIS Online Field List Configuration.

Thank you @amitchinson , I was able to get a domain list populated easily using that workaround. 😄 For any one confused about the format for the csv file is it just Label, Code <- Don't need to include these are titles or anything just list your label and code on a csv file and drag and drop that in.
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