There is the self study quiz in which you can prestudy later levels. I don’t know if you can choose specific items to learn, though, and I don’t think you can set up SRS in there. I don’t use it myself, however, so maybe it is what you’re looking for! But I don’t think it’s possible in WK itself, because it needs you to have done the kanji/radicals before it can be unlocked.
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