Percentage of unknown words in library's lessons

It seems to be useful to display not only the number of unknown words in the lessons but the percentage, too.
Isn’t it planned to add such feature?

We had this in an older version of LingQ but this functionality was cancelled because it made the system slow. I loved especially to sort lessons by percentage. What you could do now is to use the extra filters on the left for percentage of unknown words.

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It would be nice to have the percentage showing as well but displaying this number for all lessons would be very resource intensive so we haven’t done it. You can see the percentage of unknown words when you open a lesson in the Info pane in the dashboard. You can also use the percentage filters in the Advanced Settings in the Library.

Thank you, clear.