Yes, I think it would be useful. And I think it has been requested.
You could gather the data now, but it would be a bit cumbersome and would only give you a single snapshot of the data. For example, you could create a Lookup column on an entire user specific column, and then add a button that writes that lookup to a table somewhere. Then in the builder, preview as each of your users one by one and tap the button. Very tedious, and I’m not sure how useful that could be. But an option, if you desperately needed the data for some reason.
This is probably the feature request that applies here: