I want to equate the quality of something to an apple. (Bare with me, just using a random noun to make the desired construct clearer.) But instead of going around it and saying something like "it looks like an apple" or "has apple-like qualities", I want to just go ahead and say "appleness", like "Your appleness is amazing". Evidently this can't be done in valid English, but is there a way to do this in valid Japanese?
Slightly better example: "Your childishness is annoying." If don't want to say 'childishness' and instead want to specify the exact level of referenced age, say grade-schooler: "Your grade-schooler-ness is annoying." Is this doable?