Importing a .srt subtitles file as a Basic Overlays asset

I can import a .srt subtitles file using the Content Browser, and the editor produces a new Basic Overlays asset. When I double click it to see its contents, however, it comes up blank.

I can look at the .uasset file in a hex editor, and the string data does appear to be there (though the contents are otherwise unilluminating). When stepping through the C++ importing code, it does look like the code is doing the right thing.

Am I doing something wrong, or is this functionality not quite ready for use?

Version 4.22.1-0+++UE4+Release-4.22