Ya…no easy solution. If you’re looking for JUST an export of data for yourself, you can export a table by right clicking on it from the data editor.
However, if you’re looking to create in-app reports/leaderboards etc using completion data, then you’re best bet is to either add new rows to a “completion log” sheet (row intensive) or by using the “trebuchet method” to create a comma separated list of users that have created a challenge (very lean, but doesn’t capture any additional data past “who completed what”).
Here’s a video I just created that outlines how: