(FSRS) How to search within the custom data?

I am using FSRS4Anki and I want to search for all the cards that have a difficulty above a certain value (say, 8). How can do this?

Also, I want to search for cards that do not have any custom data (i.e. the cards that are not being studied via FSRS). How can I do this?

I am developing this feature:


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