I have tried adding an option (checkbox: "Calculate Statistics from Spreadsheet").
When the user unselects this option then s/he is presented with a "Statistic Table" in Hypothesis Test View. The user then can fill this table with precalculated statistic data and then can press "Recalculate" Button to perform Test.
I have added this feature because, for the test which required huge data, it is possible for user to not have access to data itself but only know statistics of data like Mean, Number of values and Standard Deviation for each column.
Various related screenshots are attached here: