Im makeing an inventory but im thinking ifis it possible to add an object array to an object array

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Javascript

im just starting out useing javascript and id like to use an inventory but im thinking of ways to implement it i was thinking object arrays is it possible to add an object array to an object array? i mean as a object in its self almost like a hierarchy any help is appreciated

What I have tried:

i havent tryed anything yet it just something im trying to figure out at the moment